OcrV1, PascalFrancis, Corpus, bibRecord, 000A42

The role of carbon during oxidation of chromium PVD coatings on iron substrates

Identifieur interne : 000A42 ( PascalFrancis/Corpus ); précédent : 000A41; suivant : 000A43

The role of carbon during oxidation of chromium PVD coatings on iron substrates

Auteurs : S. Beauvais-Reveillon ; A. M. Huntz ; C. Severac ; G. Moulin ; E. Beauprez ; G. Rautureau

Source :

Corrosion science [ 0010-938X ] ; 1995.

RBID : Pascal:95-0578477

Descripteurs français

Pascal (Inist)
- Oxydation, Dépôt physique phase vapeur, Revêtement métallique, Oxygène, Vitesse corrosion, Diffusion, Couche oxyde, Carbone, Epaisseur couche, Fer, Chrome, Corrosion.

English descriptors

KwdEn :
- Carbon, Chromium, Corrosion, Corrosion rate, Diffusion, Iron, Layer thickness, Metal coating, Oxidation, Oxide layer, Oxygen, Physical vapor deposition.

Abstract

Two distinct iron substrates (pure iron and iron containing 0.3 wt% of carbon) have been protected by chromium using physical vapor deposition. The oxidation behaviour of the Cr coating in oxygen at 700 °C depends on the iron grade, due to the influence of carbon. The study shows that carbon can be dissipated into the surrounding atmosphere, depending on its stability in the substrate and on the nature of the atmosphere (confined or dynamic oxidizing atmosphere). Carbide precipitation in the coating, near the oxide interface, decreases the oxidation rate. There is no large influence of the nature of the substrate on oxygen diffusion into the outer part of the Cr₂O₃ layer. Oxygen diffuses preferentially via interfaces, with a diffusion coefficient of 10^-14 cm²s^-1. In the chromium coating, there is a significant difference in oxygen penetration, depending on the grade of iron. Carbon incorporation into the coating is greater with the pure iron substrate than with the substrate made of iron containing 0.3 wt% carbon, and the presence of carbon in the coating decreases the oxygen diffusion, particularly along grain-boundaries : thus D_gb(O→Cr/Fe)=6.2 x 10^-13 cm²s^-1 and D_gb(O→Cr/Fe+C)=2.2 x 10^-12 cm²s^-1.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

A01	`01`	`1`		`@0 0010-938X`
A02	`01`			`@0 CRRSAA`
A03		`1`		`@0 Corros. sci.`
A05				`@2 37`
A06				`@2 11`
A08	`01`	`1`	`ENG`	`@1 The role of carbon during oxidation of chromium PVD coatings on iron substrates`
A11	`01`	`1`		`@1 BEAUVAIS-REVEILLON (S.)`
A11	`02`	`1`		`@1 HUNTZ (A. M.)`
A11	`03`	`1`		`@1 SEVERAC (C.)`
A11	`04`	`1`		`@1 MOULIN (G.)`
A11	`05`	`1`		`@1 BEAUPREZ (E.)`
A11	`06`	`1`		`@1 RAUTUREAU (G.)`
A14	`01`			`@1 CNRS Univ. Paris XI, inst. sci. matériaux, URA 1107 lab. métallurgie structurale @2 91405 Orsay @3 FRA @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 4 aut.`
A14	`02`			`@1 CREA/PS, ETCA @2 94114 Acrueil @3 FRA @Z 5 aut. @Z 6 aut.`
A20				`@1 1721-1737`
A21				`@1 1995`
A23	`01`			`@0 ENG`
A43	`01`			`@1 INIST @2 9409 @5 354000050399960040`
A44				`@0 0000`
A45				`@0 15 ref.`
A47	`01`	`1`		`@0 95-0578477`
A60				`@1 P`
A61				`@0 A`
A64	`01`	`1`		`@0 Corrosion science`
A66	`01`			`@0 GBR`
C01	`01`		`ENG`	@0 Two distinct iron substrates (pure iron and iron containing 0.3 wt% of carbon) have been protected by chromium using physical vapor deposition. The oxidation behaviour of the Cr coating in oxygen at 700 °C depends on the iron grade, due to the influence of carbon. The study shows that carbon can be dissipated into the surrounding atmosphere, depending on its stability in the substrate and on the nature of the atmosphere (confined or dynamic oxidizing atmosphere). Carbide precipitation in the coating, near the oxide interface, decreases the oxidation rate. There is no large influence of the nature of the substrate on oxygen diffusion into the outer part of the Cr₂O₃ layer. Oxygen diffuses preferentially via interfaces, with a diffusion coefficient of 10^-14 cm²s^-1. In the chromium coating, there is a significant difference in oxygen penetration, depending on the grade of iron. Carbon incorporation into the coating is greater with the pure iron substrate than with the substrate made of iron containing 0.3 wt% carbon, and the presence of carbon in the coating decreases the oxygen diffusion, particularly along grain-boundaries : thus D_gb(O→Cr/Fe)=6.2 x 10^-13 cm²s^-1 and D_gb(O→Cr/Fe+C)=2.2 x 10^-12 cm²s^-1.
C02	`01`	`1`		`@0 001D11E02`
C02	`02`	`X`		`@0 240`
C03	`01`	`X`	`FRE`	`@0 Oxydation @5 55`
C03	`01`	`X`	`ENG`	`@0 Oxidation @5 55`
C03	`01`	`X`	`GER`	`@0 Oxidation @5 55`
C03	`01`	`X`	`SPA`	`@0 Oxidación @5 55`
C03	`02`	`X`	`FRE`	`@0 Dépôt physique phase vapeur @5 56`
C03	`02`	`X`	`ENG`	`@0 Physical vapor deposition @5 56`
C03	`02`	`X`	`GER`	`@0 Physikalisches Aufdampfen @5 56`
C03	`02`	`X`	`SPA`	`@0 Deposición física fase vapor @5 56`
C03	`03`	`X`	`FRE`	`@0 Revêtement métallique @5 57`
C03	`03`	`X`	`ENG`	`@0 Metal coating @5 57`
C03	`03`	`X`	`GER`	`@0 Metallischer Ueberzug @5 57`
C03	`03`	`X`	`SPA`	`@0 Revestimiento metálico @5 57`
C03	`04`	`X`	`FRE`	`@0 Oxygène @2 NC @2 FX @5 58`
C03	`04`	`X`	`ENG`	`@0 Oxygen @2 NC @2 FX @5 58`
C03	`04`	`X`	`GER`	`@0 Sauerstoff @2 NC @2 FX @5 58`
C03	`04`	`X`	`SPA`	`@0 Oxígeno @2 NC @2 FX @5 58`
C03	`05`	`X`	`FRE`	`@0 Vitesse corrosion @5 59`
C03	`05`	`X`	`ENG`	`@0 Corrosion rate @5 59`
C03	`05`	`X`	`GER`	`@0 Korrosionsgeschwindigkeit @5 59`
C03	`05`	`X`	`SPA`	`@0 Velocidad corrosión @5 59`
C03	`06`	`X`	`FRE`	`@0 Diffusion @5 60`
C03	`06`	`X`	`ENG`	`@0 Diffusion @5 60`
C03	`06`	`X`	`GER`	`@0 Diffusion @5 60`
C03	`06`	`X`	`SPA`	`@0 Difusión @5 60`
C03	`07`	`X`	`FRE`	`@0 Couche oxyde @5 61`
C03	`07`	`X`	`ENG`	`@0 Oxide layer @5 61`
C03	`07`	`X`	`GER`	`@0 Oxidschicht @5 61`
C03	`07`	`X`	`SPA`	`@0 Capa óxido @5 61`
C03	`08`	`X`	`FRE`	`@0 Carbone @2 NC @5 62`
C03	`08`	`X`	`ENG`	`@0 Carbon @2 NC @5 62`
C03	`08`	`X`	`GER`	`@0 Kohlenstoff @2 NC @5 62`
C03	`08`	`X`	`SPA`	`@0 Carbono @2 NC @5 62`
C03	`09`	`X`	`FRE`	`@0 Epaisseur couche @5 63`
C03	`09`	`X`	`ENG`	`@0 Layer thickness @5 63`
C03	`09`	`X`	`GER`	`@0 Schichtdicke @5 63`
C03	`09`	`X`	`SPA`	`@0 Espesor capa @5 63`
C03	`10`	`X`	`FRE`	`@0 Fer @1 SUB @2 NC @5 65`
C03	`10`	`X`	`ENG`	`@0 Iron @1 SUB @2 NC @5 65`
C03	`10`	`X`	`GER`	`@0 Eisen @1 SUB @2 NC @5 65`
C03	`10`	`X`	`SPA`	`@0 Hierro @1 SUB @2 NC @5 65`
C03	`11`	`X`	`FRE`	`@0 Chrome @1 SEC @2 NC @2 FX @5 66`
C03	`11`	`X`	`ENG`	`@0 Chromium @1 SEC @2 NC @2 FX @5 66`
C03	`11`	`X`	`GER`	`@0 Chrom @1 SEC @2 NC @2 FX @5 66`
C03	`11`	`X`	`SPA`	`@0 Cromo @1 SEC @2 NC @2 FX @5 66`
C03	`12`	`X`	`FRE`	`@0 Corrosion @5 74`
C03	`12`	`X`	`ENG`	`@0 Corrosion @5 74`
C03	`12`	`X`	`GER`	`@0 Korrosion @5 74`
C03	`12`	`X`	`SPA`	`@0 Corrosión @5 74`
N21				`@1 331`

Format Inist (serveur)

NO :	PASCAL 95-0578477 INIST
ET :	The role of carbon during oxidation of chromium PVD coatings on iron substrates
AU :	BEAUVAIS-REVEILLON (S.); HUNTZ (A. M.); SEVERAC (C.); MOULIN (G.); BEAUPREZ (E.); RAUTUREAU (G.)
AF :	CNRS Univ. Paris XI, inst. sci. matériaux, URA 1107 lab. métallurgie structurale/91405 Orsay/France (1 aut., 2 aut., 3 aut., 4 aut.); CREA/PS, ETCA/94114 Acrueil/France (5 aut., 6 aut.)
DT :	Publication en série; Niveau analytique
SO :	Corrosion science; ISSN 0010-938X; Coden CRRSAA; Royaume-Uni; Da. 1995; Vol. 37; No. 11; Pp. 1721-1737; Bibl. 15 ref.
LA :	Anglais
EA :	Two distinct iron substrates (pure iron and iron containing 0.3 wt% of carbon) have been protected by chromium using physical vapor deposition. The oxidation behaviour of the Cr coating in oxygen at 700 °C depends on the iron grade, due to the influence of carbon. The study shows that carbon can be dissipated into the surrounding atmosphere, depending on its stability in the substrate and on the nature of the atmosphere (confined or dynamic oxidizing atmosphere). Carbide precipitation in the coating, near the oxide interface, decreases the oxidation rate. There is no large influence of the nature of the substrate on oxygen diffusion into the outer part of the Cr₂O₃ layer. Oxygen diffuses preferentially via interfaces, with a diffusion coefficient of 10^-14 cm²s^-1. In the chromium coating, there is a significant difference in oxygen penetration, depending on the grade of iron. Carbon incorporation into the coating is greater with the pure iron substrate than with the substrate made of iron containing 0.3 wt% carbon, and the presence of carbon in the coating decreases the oxygen diffusion, particularly along grain-boundaries : thus D_gb(O→Cr/Fe)=6.2 x 10^-13 cm²s^-1 and D_gb(O→Cr/Fe+C)=2.2 x 10^-12 cm²s^-1.
CC :	001D11E02; 240
FD :	Oxydation; Dépôt physique phase vapeur; Revêtement métallique; Oxygène; Vitesse corrosion; Diffusion; Couche oxyde; Carbone; Epaisseur couche; Fer; Chrome; Corrosion
ED :	Oxidation; Physical vapor deposition; Metal coating; Oxygen; Corrosion rate; Diffusion; Oxide layer; Carbon; Layer thickness; Iron; Chromium; Corrosion
GD :	Oxidation; Physikalisches Aufdampfen; Metallischer Ueberzug; Sauerstoff; Korrosionsgeschwindigkeit; Diffusion; Oxidschicht; Kohlenstoff; Schichtdicke; Eisen; Chrom; Korrosion
SD :	Oxidación; Deposición física fase vapor; Revestimiento metálico; Oxígeno; Velocidad corrosión; Difusión; Capa óxido; Carbono; Espesor capa; Hierro; Cromo; Corrosión
LO :	INIST-9409.354000050399960040
ID :	95-0578477

Links to Exploration step

Pascal:95-0578477

Le document en format XML

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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">The role of carbon during oxidation of chromium PVD coatings on iron substrates</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Carbon</term>
<term>Chromium</term>
<term>Corrosion</term>
<term>Corrosion rate</term>
<term>Diffusion</term>
<term>Iron</term>
<term>Layer thickness</term>
<term>Metal coating</term>
<term>Oxidation</term>
<term>Oxide layer</term>
<term>Oxygen</term>
<term>Physical vapor deposition</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Oxydation</term>
<term>Dépôt physique phase vapeur</term>
<term>Revêtement métallique</term>
<term>Oxygène</term>
<term>Vitesse corrosion</term>
<term>Diffusion</term>
<term>Couche oxyde</term>
<term>Carbone</term>
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<front><div type="abstract" xml:lang="en">Two distinct iron substrates (pure iron and iron containing 0.3 wt% of carbon) have been protected by chromium using physical vapor deposition. The oxidation behaviour of the Cr coating in oxygen at 700 °C depends on the iron grade, due to the influence of carbon. The study shows that carbon can be dissipated into the surrounding atmosphere, depending on its stability in the substrate and on the nature of the atmosphere (confined or dynamic oxidizing atmosphere). Carbide precipitation in the coating, near the oxide interface, decreases the oxidation rate. There is no large influence of the nature of the substrate on oxygen diffusion into the outer part of the Cr<sub>2</sub>
O<sub>3</sub>
 layer. Oxygen diffuses preferentially via interfaces, with a diffusion coefficient of 10<sup>-14</sup>
 cm<sup>2</sup>
s<sup>-1</sup>
. In the chromium coating, there is a significant difference in oxygen penetration, depending on the grade of iron. Carbon incorporation into the coating is greater with the pure iron substrate than with the substrate made of iron containing 0.3 wt% carbon, and the presence of carbon in the coating decreases the oxygen diffusion, particularly along grain-boundaries : thus D<sub>gb</sub>
(O→Cr/Fe)=6.2 x 10<sup>-13</sup>
 cm<sup>2</sup>
s<sup>-1</sup>
 and D<sub>gb</sub>
(O→Cr/Fe+C)=2.2 x 10<sup>-12</sup>
 cm<sup>2</sup>
s<sup>-1</sup>
.</div>
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<fA66 i1="01"><s0>GBR</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>Two distinct iron substrates (pure iron and iron containing 0.3 wt% of carbon) have been protected by chromium using physical vapor deposition. The oxidation behaviour of the Cr coating in oxygen at 700 °C depends on the iron grade, due to the influence of carbon. The study shows that carbon can be dissipated into the surrounding atmosphere, depending on its stability in the substrate and on the nature of the atmosphere (confined or dynamic oxidizing atmosphere). Carbide precipitation in the coating, near the oxide interface, decreases the oxidation rate. There is no large influence of the nature of the substrate on oxygen diffusion into the outer part of the Cr<sub>2</sub>
O<sub>3</sub>
 layer. Oxygen diffuses preferentially via interfaces, with a diffusion coefficient of 10<sup>-14</sup>
 cm<sup>2</sup>
s<sup>-1</sup>
. In the chromium coating, there is a significant difference in oxygen penetration, depending on the grade of iron. Carbon incorporation into the coating is greater with the pure iron substrate than with the substrate made of iron containing 0.3 wt% carbon, and the presence of carbon in the coating decreases the oxygen diffusion, particularly along grain-boundaries : thus D<sub>gb</sub>
(O→Cr/Fe)=6.2 x 10<sup>-13</sup>
 cm<sup>2</sup>
s<sup>-1</sup>
 and D<sub>gb</sub>
(O→Cr/Fe+C)=2.2 x 10<sup>-12</sup>
 cm<sup>2</sup>
s<sup>-1</sup>
.</s0>
</fC01>
<fC02 i1="01" i2="1"><s0>001D11E02</s0>
</fC02>
<fC02 i1="02" i2="X"><s0>240</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Oxydation</s0>
<s5>55</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Oxidation</s0>
<s5>55</s5>
</fC03>
<fC03 i1="01" i2="X" l="GER"><s0>Oxidation</s0>
<s5>55</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Oxidación</s0>
<s5>55</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Dépôt physique phase vapeur</s0>
<s5>56</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Physical vapor deposition</s0>
<s5>56</s5>
</fC03>
<fC03 i1="02" i2="X" l="GER"><s0>Physikalisches Aufdampfen</s0>
<s5>56</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Deposición física fase vapor</s0>
<s5>56</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Revêtement métallique</s0>
<s5>57</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Metal coating</s0>
<s5>57</s5>
</fC03>
<fC03 i1="03" i2="X" l="GER"><s0>Metallischer Ueberzug</s0>
<s5>57</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Revestimiento metálico</s0>
<s5>57</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Oxygène</s0>
<s2>NC</s2>
<s2>FX</s2>
<s5>58</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Oxygen</s0>
<s2>NC</s2>
<s2>FX</s2>
<s5>58</s5>
</fC03>
<fC03 i1="04" i2="X" l="GER"><s0>Sauerstoff</s0>
<s2>NC</s2>
<s2>FX</s2>
<s5>58</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Oxígeno</s0>
<s2>NC</s2>
<s2>FX</s2>
<s5>58</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Vitesse corrosion</s0>
<s5>59</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Corrosion rate</s0>
<s5>59</s5>
</fC03>
<fC03 i1="05" i2="X" l="GER"><s0>Korrosionsgeschwindigkeit</s0>
<s5>59</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Velocidad corrosión</s0>
<s5>59</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Diffusion</s0>
<s5>60</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Diffusion</s0>
<s5>60</s5>
</fC03>
<fC03 i1="06" i2="X" l="GER"><s0>Diffusion</s0>
<s5>60</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Difusión</s0>
<s5>60</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Couche oxyde</s0>
<s5>61</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Oxide layer</s0>
<s5>61</s5>
</fC03>
<fC03 i1="07" i2="X" l="GER"><s0>Oxidschicht</s0>
<s5>61</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Capa óxido</s0>
<s5>61</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Carbone</s0>
<s2>NC</s2>
<s5>62</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Carbon</s0>
<s2>NC</s2>
<s5>62</s5>
</fC03>
<fC03 i1="08" i2="X" l="GER"><s0>Kohlenstoff</s0>
<s2>NC</s2>
<s5>62</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Carbono</s0>
<s2>NC</s2>
<s5>62</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Epaisseur couche</s0>
<s5>63</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Layer thickness</s0>
<s5>63</s5>
</fC03>
<fC03 i1="09" i2="X" l="GER"><s0>Schichtdicke</s0>
<s5>63</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Espesor capa</s0>
<s5>63</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Fer</s0>
<s1>SUB</s1>
<s2>NC</s2>
<s5>65</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Iron</s0>
<s1>SUB</s1>
<s2>NC</s2>
<s5>65</s5>
</fC03>
<fC03 i1="10" i2="X" l="GER"><s0>Eisen</s0>
<s1>SUB</s1>
<s2>NC</s2>
<s5>65</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Hierro</s0>
<s1>SUB</s1>
<s2>NC</s2>
<s5>65</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Chrome</s0>
<s1>SEC</s1>
<s2>NC</s2>
<s2>FX</s2>
<s5>66</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Chromium</s0>
<s1>SEC</s1>
<s2>NC</s2>
<s2>FX</s2>
<s5>66</s5>
</fC03>
<fC03 i1="11" i2="X" l="GER"><s0>Chrom</s0>
<s1>SEC</s1>
<s2>NC</s2>
<s2>FX</s2>
<s5>66</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Cromo</s0>
<s1>SEC</s1>
<s2>NC</s2>
<s2>FX</s2>
<s5>66</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Corrosion</s0>
<s5>74</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Corrosion</s0>
<s5>74</s5>
</fC03>
<fC03 i1="12" i2="X" l="GER"><s0>Korrosion</s0>
<s5>74</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Corrosión</s0>
<s5>74</s5>
</fC03>
<fN21><s1>331</s1>
</fN21>
</pA>
</standard>
<server><NO>PASCAL 95-0578477 INIST</NO>
<ET>The role of carbon during oxidation of chromium PVD coatings on iron substrates</ET>
<AU>BEAUVAIS-REVEILLON (S.); HUNTZ (A. M.); SEVERAC (C.); MOULIN (G.); BEAUPREZ (E.); RAUTUREAU (G.)</AU>
<AF>CNRS Univ. Paris XI, inst. sci. matériaux, URA 1107 lab. métallurgie structurale/91405 Orsay/France (1 aut., 2 aut., 3 aut., 4 aut.); CREA/PS, ETCA/94114 Acrueil/France (5 aut., 6 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Corrosion science; ISSN 0010-938X; Coden CRRSAA; Royaume-Uni; Da. 1995; Vol. 37; No. 11; Pp. 1721-1737; Bibl. 15 ref.</SO>
<LA>Anglais</LA>
<EA>Two distinct iron substrates (pure iron and iron containing 0.3 wt% of carbon) have been protected by chromium using physical vapor deposition. The oxidation behaviour of the Cr coating in oxygen at 700 °C depends on the iron grade, due to the influence of carbon. The study shows that carbon can be dissipated into the surrounding atmosphere, depending on its stability in the substrate and on the nature of the atmosphere (confined or dynamic oxidizing atmosphere). Carbide precipitation in the coating, near the oxide interface, decreases the oxidation rate. There is no large influence of the nature of the substrate on oxygen diffusion into the outer part of the Cr<sub>2</sub>
O<sub>3</sub>
 layer. Oxygen diffuses preferentially via interfaces, with a diffusion coefficient of 10<sup>-14</sup>
 cm<sup>2</sup>
s<sup>-1</sup>
. In the chromium coating, there is a significant difference in oxygen penetration, depending on the grade of iron. Carbon incorporation into the coating is greater with the pure iron substrate than with the substrate made of iron containing 0.3 wt% carbon, and the presence of carbon in the coating decreases the oxygen diffusion, particularly along grain-boundaries : thus D<sub>gb</sub>
(O→Cr/Fe)=6.2 x 10<sup>-13</sup>
 cm<sup>2</sup>
s<sup>-1</sup>
 and D<sub>gb</sub>
(O→Cr/Fe+C)=2.2 x 10<sup>-12</sup>
 cm<sup>2</sup>
s<sup>-1</sup>
.</EA>
<CC>001D11E02; 240</CC>
<FD>Oxydation; Dépôt physique phase vapeur; Revêtement métallique; Oxygène; Vitesse corrosion; Diffusion; Couche oxyde; Carbone; Epaisseur couche; Fer; Chrome; Corrosion</FD>
<ED>Oxidation; Physical vapor deposition; Metal coating; Oxygen; Corrosion rate; Diffusion; Oxide layer; Carbon; Layer thickness; Iron; Chromium; Corrosion</ED>
<GD>Oxidation; Physikalisches Aufdampfen; Metallischer Ueberzug; Sauerstoff; Korrosionsgeschwindigkeit; Diffusion; Oxidschicht; Kohlenstoff; Schichtdicke; Eisen; Chrom; Korrosion</GD>
<SD>Oxidación; Deposición física fase vapor; Revestimiento metálico; Oxígeno; Velocidad corrosión; Difusión; Capa óxido; Carbono; Espesor capa; Hierro; Cromo; Corrosión</SD>
<LO>INIST-9409.354000050399960040</LO>
<ID>95-0578477</ID>
</server>
</inist>
</record>

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The role of carbon during oxidation of chromium PVD coatings on iron substrates

The role of carbon during oxidation of chromium PVD coatings on iron substrates

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