Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第5期    总第74期    2005年5月

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文章编号: 1004-0609(2005)05-0734-05
微量元素Sr对Al-Mg-Si-Cu基合金
车身板腐蚀性能的影响
卢广玺, 关绍康, 陈海军, 林敦文

(郑州大学 材料工程学院, 郑州 450002)

摘 要: 采用全浸腐蚀实验、 盐雾实验和电化学实验研究了微量元素Sr对Al-Mg-Si-Cu合金车身板腐蚀性能的影响。 全浸腐蚀实验结果表明: 合金加入Sr后, 其质量损失速度由2.76 mg/(h·cm2) 降为1.39 mg/(h·cm2), 盐雾实验结果表明: 合金加入Sr后, 其质量损失速度由8.56×10-3 mg/(h·cm2) 降为5.90×10-3 mg/(h·cm2), Sr可以明显减缓合金的腐蚀速度。 电化学实验结果表明: 合金加入Sr后, 合金稳定电位较负, 稳定时间长, 合金钝化区较短, 腐蚀电位φcorr更负, 且腐蚀电流密度较小。

 

关键词:  Al-Mg-Si-Cu基合金; 车身板; Sr; 腐蚀性能

Effect of microelement Sr on corrosion properties of Al-Mg-Si-Cu based
 alloy auto sheets
LU Guang-xi, GUAN Shao-kang, CHEN Hai-jun, LIN Dun-wen

School of Materials Engineering, Zhengzhou University,
 Zhengzhou 450002, China

Abstract: The effect of microelement Sr on the corrosion properties of Al-Mg-Si-Cu based alloy auto sheets was studied by means of immersion corrosion, salt spray corrosion and electrochemistry test. The results of immersion tests show that the rate of mass loss is depressed from 2.76 to 1.39 mg/(h·cm2) when Sr is added into the alloy and the rate of mass loss is depressed from 8.56×10-3 to 5.90×10-3 mg/(h·cm2) in salt spray tests. Sr can minish the corrosion rate of the alloy obviously. The results of electrochemistry tests show that when Sr is added into alloy, the steady voltage of alloy is more negative, the steady time is prolonged, the passivation area of alloy becomes shorter, φcorr is negative and the density of corrosion current becomes smaller.

 

Key words: Al-Mg-Si-Cu based alloy; auto sheet; strontium; corrosion property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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