Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings

被引：1
作者：
Malla, A. D. [1 ]
Sullivan, J. H. [1 ]
Penney, D. J. [1 ]
Goldsworthy, M. [1 ]
Britton, D. [1 ]
Williams, G. [1 ]
Goodwin, F. [2 ]
Cardoso, A. P. [3 ]
机构：
[1] Swansea Univ, Dept Mat, Corros & Coatings Grp, Bay Campus,Fabian Way, Swansea SA1 8EN, Wales
[2] Int Zinc Assoc, Durham, NC 27713 USA
[3] Int Zinc Assoc, B-1150 Brussels, Belgium
来源：
NPJ MATERIALS DEGRADATION | 2024年 / 8卷 / 01期
关键词：
COATED STEEL; LOCALIZED CORROSION; OXYGEN REDUCTION; ZINC; PRODUCTS; SURFACE; ELECTROLYTE; MAGNESIUM; MODEL;
D O I：
10.1038/s41529-024-00494-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Time-lapse Microscopy, scanning vibrating electrode technique and potentiodynamic methods were used to study the influence of increasing coating weight (80-310 gm-2) on microstructure, cut-edge and surface corrosion of Zn-Mg-Al coatings in 0.17 M NaCl. Cut-edge corrosion was similar for all coatings due to the oxygen reduction reaction becoming diffusion-limited. A 64% reduction in surface corrosion was observed for high coating weights through increases in eutectic volume fraction. Spatial and temporal corrosion mechanisms were controlled by microstructural morphological differences as coating weight varied. 80 g.m-2 coatings demonstrated lateral anodic spreading potentially reducing coating penetration rates despite their higher surface corrosion rate.
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页数：14
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