Effects of Al contents on microstructure and properties of hot-dip Zn-Al alloy coatings on hydrogen reduced hot-rolled steel without acid pickling

被引：0

作者：

Zhi-feng Li ^{[1
]}

Yong-quan He ^{[2
]}

Guang-ming Cao ^{[1
]}

Jun-jian Tang ^{[1
]}

Xiang-jun Zhang ^{[1
]}

Zhen-yu Liu ^{[1
]}

机构：

[1] State Key Laboratory of Rolling and Automation,Northeastern University

[2] School of Mechatronics Engineering,Zhengzhou University of Aeronautics

来源：

JournalofIronandSteelResearch(International) | 2017年 / 24卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Hot-rolled steel strip; Hydrogen reduction; Eutectoid structure; Micro-hardness; Corrosion resistance; Zn-Al alloy coating;

D O I：

暂无

中图分类号：

TG142.1 [钢的组织与性能]; TG174.4 [金属表面防护技术];

学科分类号：

摘要：

A new hot-dip galvanizing method was employed on hot-rolled low carbon steel.The effects of Al contents on microstructure,micro-hardness and corrosion resistance of Zn-Al alloy coatings were systematically investigated.Phase composition,microstructure and element distribution in Zn-Al alloy coatings were analyzed using X-ray diffraction(XRD)and electron probe micro analysis(EPMA),respectively.It is found that Al content(0.6-6.0 wt.%)in galvanizing zinc affects surface quality and adhesion between coatings and matrix in the newly developed method.In addition,with increasing Al content,micro-hardness significantly increased due to the increase in Zn-Al eutectoid phases.Potentiodynamic polarization and electrochemical impedance spectroscopy(EIS)also revealed that increase in Al plays a noticeable role in improving the corrosion resistance of Zn-Al alloy coatings.

引用

页码：1032 / 1040

页数：9

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