Al-Zn-Mg-Cu合金的局部腐蝕行為與Zn、Mg含量的關系

Al-Zn-Mg-Cu合金的局部腐蝕行為與Zn、Mg含量的關系Behavior of localized corrosion of Al-Zn-Mg-Cu alloys in relation with their Zn and Mg contents

研究了峰值時效狀態下，不同Zn、Mg含量(質量分數)對高Cu含量(2.0%~2.5%)的Al-Zn-Mg-Cu合金耐局部腐蝕能力的影響，利用透射電鏡和掃描電鏡表征了合金局部腐蝕行為與其微觀結構之間的關系。結果表明：對Mg含量不同的兩組目標合金，Zn含量降低，合金的耐局部腐蝕能力變差；對應比較Mg含量不同的兩組合金，初始階段低Mg組合金的耐晶間腐蝕能力較差，但深度發展階段低Mg組合金的耐晶間腐蝕能力較好；前期階段高Mg組合金的耐剝蝕能力較好，但后期深度腐蝕階段，高Mg組合金的耐剝蝕能力變得較差。

It has generally been believed that the Cu addition in Al-Zn-Mg-Cu alloys can improve the stress corrosion resistance of the alloys. Nonetheless, for such alloys with a high Cu-content, few papers have paid attention to their exfoliation corrosion (EXCO) and intergranular corrosion (IGC) (two kinds of localized corrosion) resistance in relation with their Zn and Mg contents. In the present study, peak-aged Al-Zn-Mg-Cu alloys with relatively high Cu contents (2.0%-2.5%) were studied for their localized corrosion behaviors with varying Zn and Mg contents. By scanning/transmission electron microscopy (S/TEM), the microstructures of the alloys were characterized in relation with their properties of corrosion resistance. The alloys were classified into two groups: one with higher Mg content (high-Mg group) and another with lower Mg content (low-Mg group). The results show the following: 1) For both the two groups of alloys, with decreasing the Zn-content, their localized corrosion resistance decreases without exception; 2) The high-Mg group of alloys are worse than the low-Mg group of alloys in IGC resistance in their initial stages of corrosion, but better in their late stages; 3) For EXCO resistance, the former group is better than the late group in their early-stages of corrosion, but worse in their late stages of in-depth corrosion.

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