含Bi易切削变形Zn-Al合金的腐蚀行为

张锐; 林高用; 王莉; 贺家健

doi:10.15980/j.tzzz.2012.08.035

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含Bi易切削变形Zn-Al合金的腐蚀行为
Corrosion Behavior of Free-Cutting Zn-Al Alloy Contained Bi
2012年32卷第8期页码：779-782
纸质出版日期： 2012 ，
DOI： 10.15980/j.tzzz.2012.08.035

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[1]张锐,林高用,王莉,贺家健.含Bi易切削变形Zn-Al合金的腐蚀行为[J].特种铸造及有色合金,2012,32(08):779-782.

Zhang Rui1, Lin Gaoyong1, Wang Li1, et al. Corrosion Behavior of Free-Cutting Zn-Al Alloy Contained Bi[J]. Special Casting & Nonferrous Alloys, 2012,32(8):779-782.
[1]张锐,林高用,王莉,贺家健.含Bi易切削变形Zn-Al合金的腐蚀行为[J].特种铸造及有色合金,2012,32(08):779-782. DOI： 10.15980/j.tzzz.2012.08.035.

Zhang Rui1, Lin Gaoyong1, Wang Li1, et al. Corrosion Behavior of Free-Cutting Zn-Al Alloy Contained Bi[J]. Special Casting & Nonferrous Alloys, 2012,32(8):779-782. DOI： 10.15980/j.tzzz.2012.08.035.

摘要

对自行研制的4种不同Bi含量易切削Zn-Al合金在3.5%的NaCl溶液中进行浸泡腐蚀试验

并与潮湿和干燥空气中的试样作对比。采用X射线衍射、场发射扫描电镜、能谱分析以及电化学测试等手段研究了合金在不同介质中的腐蚀行为。结果表明

合金的腐蚀主要表现为点蚀。随着Bi含量的增加

平均腐蚀速率加快。合金中的富铝α相是易腐蚀相

Zn-Al合金的腐蚀过程是以η相作为阴极

Al组元作为阳极而溶解的电化学腐蚀过程。

Abstract

Corrosion experiment of four self-developed free-cutting Zn-Al alloys with varied Bi was conducted in the 3.5%NaCl solution

and the comparative testing was performed both in the humid air and dry air.The corrosion behavior was investigated by means of X-ray diffraction(XRD)

field emission scanning electron microscopy

energy spectrum analysis and electrochemistry testing.The results show that the main corrosion exhibits spot corrosion in the alloy.With increasing in the content of Bi

the average rate of corrosion is increased.The Al-rich phase in Zn-Al alloy is easier to be corroded

and the corrosion process belongs to electrochemical corrosion

in which η phase is acted as the anode and Al as cathode.