ZnAl12Mg3Si0.3双批次热浸镀层的微观结构与腐蚀行为

Microstructure and Corrosion Behavior of ZnAl12Mg3Si0.3 Double-Batch Hot-Dip Coatings.

作者信息

Kania Henryk, Marek Anżelina, Zoran Michał, Spławski Marcin, Kupczyk Przemysław, Wiewióra Mateusz, Kupczyk Aleksandra

机构信息

Department of Metallurgy and Recycling, Faculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland.

Faculty of Transport and Aviation Engineering, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland.

出版信息

Materials (Basel). 2023 Mar 8;16(6):2162. doi: 10.3390/ma16062162.

DOI:10.3390/ma16062162

PMID:36984042

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10052979/

Abstract

This article presents the microstructure (SEM) and corrosion behavior of ZnAl12Mg3Si0.3 (ZAMS) coatings obtained by the double hot-dip method on Sebisty steel with increased strength. On the basis of chemical composition studies in micro-areas (EDS) and phase composition studies (XRD), structural components of the coating and corrosion products formed on the coating surface after exposure to the neutral salt spray (NSS) test (EN ISO 9227) were identified. The presence of the Fe(Al,Si,Zn) intermetallic phase was found in the Fe-Al intermetallic layer, while in the outer layer, dendrites rich in Al and Zn were identified. In these dendrites, the eutectics of Zn/MgZn and precipitates of the MgZn phase and Si were located. The NSS test showed better corrosion resistance of ZAMS coatings compared to conventional zinc hot-dip coatings. The increase in corrosion resistance is due to the formation of favorable corrosion products: simonkolleite-Zn(OH)Cl·HO and hydrozincite-Zn(OH)(CO), and the presence of the MgZn phase in the coating, which is more anodic than other structural components.

摘要

本文介绍了通过双热浸法在高强度Sebisty钢上获得的ZnAl12Mg3Si0.3（ZAMS）涂层的微观结构（扫描电子显微镜）和腐蚀行为。基于微区化学成分研究（能谱分析）和相组成研究（X射线衍射），确定了涂层的结构成分以及在中性盐雾（NSS）试验（EN ISO 9227）后在涂层表面形成的腐蚀产物。在Fe-Al金属间化合物层中发现了Fe(Al,Si,Zn)金属间相，而在外层中，识别出了富含Al和Zn的树枝晶。在这些树枝晶中，存在Zn/MgZn共晶以及MgZn相和Si的析出物。NSS试验表明，与传统热浸锌涂层相比，ZAMS涂层具有更好的耐腐蚀性。耐腐蚀性的提高归因于形成了有利的腐蚀产物：氯氧化锌 - Zn(OH)Cl·H₂O和碱式碳酸锌 - Zn(OH)₂(CO₃)，以及涂层中MgZn相的存在，该相比其他结构成分更具阳极活性。