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Alloy design of graded Zn-Cr PVD coatings for corrosionprotection of cold formed automotive parts

Published online by Cambridge University Press:  06 July 2011

C.P. Scott ,
P. Choquet  and
C. Musik
C.P. Scott
Affiliation:
ArcelorMittal Research, BP 30320, 57283 Maizières les Metz Cedex, France. e-mail: [email protected]
P. Choquet
Affiliation:
CRP-Gabriel Lippmann, 41 rue du Brill, 4422 Belvaux, Luxembourg
C. Musik
Affiliation:
ArcelorMittal Research, BP 30320, 57283 Maizières les Metz Cedex, France. e-mail: [email protected]
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Abstract

PVD ZnCr coatings exhibit different metastable crystal structures δ, ζ, Γ depending onthe Cr content and the deposition conditions. Here we describe the different mechanicaland electrochemical properties of these phases. We show that by introducing an appropriateCr concentration profile it is possible to produce a ZnCr coating with a thin Γ-phaseinterface layer optimized for substrate adhesion and a δ-phase matrix with a strongbasal texture which possesses excellent cold forming properties. This alloy coating istailored so that the application of a short low temperature annealing step after forming,such as an automotive paint bake hardening treatment, transforms the textured δ-phaseinto a nanocrystalline ı-phase with no marked texture. The latter microstructure providessignificantly improved primary corrosion protection.

Keywords

ZnCrPVDTEMSVETalloy designmechanical propertiesRevêtements PVD anti-corrosionalliages ZnCrgradient de composition
Type
Research Article
Information
Metallurgical Research & Technology , Volume 107 , Issue 10-11 , November 2010 , pp. 457 - 467
Copyright
© EDP Sciences

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