Study on the corrosion resistance of aluminum/steel joints brazed by ZnAl and AlSi（X） filler metal

XUE Hongyu; LONG Weimin; LU Quanbin; JIU Yongtao; CHENG Zhan; XUE Hangyan

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Study on the corrosion resistance of aluminum/steel joints brazed by ZnAl and AlSi（X） filler metal
Vol. 48, Issue 4, Pages: 76-80(2018)
Published：2018
DOI：
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DOI：

XUE Hongyu, LONG Weimin, LU Quanbin, et al. Study on the corrosion resistance of aluminum/steel joints brazed by ZnAl and AlSi（X） filler metal[J]. Eletric Welding Machine2018, 48(4): 76-80. DOI：

摘要

采用扫描电镜、能谱分析及电化学腐蚀、盐雾腐蚀和力学性能测试等实验分析手段研究ZnAl2、AlSi12和AlSiNi钎料的铝/钢钎焊接头耐腐蚀性。实验表明

母材和钎缝耐腐蚀性由强至弱依次是:Q235钢、3003铝合金、AlSiNi钎缝、AlSi12钎缝、ZnAl2钎缝

钎缝金属易被腐蚀;经过240 h的盐雾腐蚀实验

AlSiNi接头抗拉强度降低27%

耐腐蚀性最强

Ni元素有效提高了AlSi钎料的耐腐蚀性

ZnAl2接头抗拉强度衰减达92%

耐腐蚀性最差;ZnAl2接头中残留的立体"花状"锌铝相表明钎缝中的Zn相会优先被腐蚀;AlSiNi、AlSi12接头中的腐蚀优先产生于母材钢/钎缝界面处

钎缝一侧的α-Al相优先被腐蚀。

Abstract

The corrosion resistance of aluminum/steel joints brazed by ZnAl2

AlSi12 and AlSiNi filler metals were analyzed by means of SEM

EDS

electrochemical corrosion test

salt spray corrosion test and mechanical property test. Experiments show that the corrosion resistance from strong to weak are Q235 steel

3003 aluminum alloy

AlSiNi

AlSi12 and ZnAl2;brazing seam metal is more susceptible to corrosion. After 240 hours’ salt spray corrosion test

ZnAl2 joints’ tensile strength decreased by 92%

showed the worst corrosion-resistance;AlSiNi joints’ tensile strength decreased by 27%

showed the best corrosion-resistance

Ni element could effectively improve the corrosion resistance of Al Si filler metal. The corrosion in AlSiNi and AlSi12 brazing joints preferentially occured at the interface of steel and brazing seam

the α-Al phase was firstly corroded. The Zn phase in ZnAl2 brazing joints was firstly corroded.