Surface chemistry and reactivity of skin-passed hot dip galvanized coating

Jean-Michel Mataigne (1) , Véronique Vaché (2) , Monique Repoux (2)

1 ArcelorMittal Maizières Research SA
2 CEMEF - Centre de Mise en Forme des Matériaux

GI coatings are covered by a very thin aluminum layer that precipitates after wiping. Anisotropic growing of zinc crystals during solidification induces a strong basal texture in GI coatings. Skin-pass induced changes in GI coating surface chemistry, crystallography and reactivity have been assessed. Local coating analyses have been performed (XPS, TOF-SIMS) in order to describe local effects of roughness indentation during skin-pass on coating characteristics. A laboratory bi-crushing device supported by XRD and EBSD has been used to analyze the aluminum oxide behaviour during deformation and ageing. Reactivity of such surfaces has been tested using fatty acids.

Mots clés: Alumina; Aluminum; Capillarity; Chemical reactions; Crystallography; Fatty acids; Galvanized metal; Secondary ion mass spectrometry; Skin; Surface chemistry; Zinc

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Jean-Michel Mataigne, Véronique Vaché, Monique Repoux. Surface chemistry and reactivity of skin-passed hot dip galvanized coating. Revue de Metallurgie. Cahiers D'Informations Techniques, 2009, 106 (1), pp.41-47. ⟨10.1051/metal/2009013⟩. ⟨hal-00509799⟩