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

被引：0

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.

引用

页数：14

共 41 条

[1] Corrosion mechanisms of Zn(Mg,Al) coated steel: 2. The effect of Mg and Al alloying on the formation and properties of corrosion products in different electrolytes
Azevedo, M. Salgueiro
Allely, C.
Ogle, K.
Volovitch, P.
[J]. CORROSION SCIENCE, 2015, 90 : 482 - 490
[2] On the Application of the Scanning Vibrating Electrode Technique (SVET) to Corrosion Research
Bastos, A. C.
Quevedo, M. C.
Karavai, O. V.
Ferreira, M. G. S.
[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2017, 164 (14) : C973 - C990
[3] Photoelectrochemical investigation of corrosion using scanning electrochemical techniques
Böhm, S
McMurray, HN
Powell, SM
Worsley, DA
[J]. ELECTROCHIMICA ACTA, 2000, 45 (14) : 2165 - 2174
[4] The kinetics and mechanism of cathodic oxygen reduction on zinc and zinc-aluminium alloy galvanized coatings
Dafydd, H
Worsley, DA
McMurray, HN
[J]. CORROSION SCIENCE, 2005, 47 (12) : 3006 - 3018
[5] A review on physical vapor deposition-based metallic coatings on steel as an alternative to conventional galvanized coatings
Dan, Atasi
Bijalwan, Pavan Kumar
Pathak, Abhishek Subhas
Bhagat, Amar Nath
[J]. JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, 2022, 19 (02) : 403 - 438
[6] Nanoscopic view on the initial stages of corrosion of hot dip galvanized Zn-Mg-Al coatings
Duchoslav, J.
Arndt, M.
Steinberger, R.
Keppert, T.
Luckeneder, G.
Stellnberger, K. H.
Hagler, J.
Riener, C. K.
Angeli, G.
Stifter, D.
[J]. CORROSION SCIENCE, 2014, 83 : 327 - 334
[7] XPS investigation on the surface chemistry of corrosion products on ZnMgAl-coated steel
Duchoslav, J.
Arndt, M.
Keppert, T.
Luckeneder, G.
Stifter, D.
[J]. ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 2013, 405 (22) : 7133 - 7144
[8] Coating weight model for the continuous hot-dip galvanizing process
Elsaadawy, E. A.
Hanumanth, G. S.
Balthazaar, A. K. S.
McDermid, J. R.
Hrymak, A. N.
Forbes, J. F.
[J]. METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2007, 38 (03): : 413 - 424
[9] Microstructural changes in zinc aluminium alloy galvanising as a function of processing parameters and their influence on corrosion
Elvins, J
Spittle, JA
Worsley, DA
[J]. CORROSION SCIENCE, 2005, 47 (11) : 2740 - 2759
[10] Dealloying of MgZn2 Intermetallic in Slightly Alkaline Chloride Electrolyte and Its Significance in Corrosion Resistance
Han, J.
Ogle, K.
[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2017, 164 (14) : C952 - C961

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