摘要
分别研究了ＬＹ１２ＣＺ合金中的纯铝（Ａｌ）、晶间化合物θ（ＣｕＡｌ２）、Ｓ（Ａｌ２ＣｕＭｇ）和ＭｎＡｌ６在含Ｃｌ－离子的中性溶液中的电化学腐蚀行为。结果表明，各合金相作为独立相在含Ｃｌ－离子的中性介质中均有点蚀敏感性，其中Ｓ相耐蚀性最差，Ｌ１相耐蚀性最好。各相点蚀主要是由于Ａｌ或Ｍｇ的阳极溶解所致，腐蚀产物主要是铝的不溶性氢氧化物、可溶性氯化物及镁的可溶性盐类。
The electrochemical corrosion behaviour of the LY12CZ aluminium alloy, the L1(pure Al) and the intermetallic compounds of θ phase (CuAl 2 ),S phase (Al 2CuMg),and MnAl 6 was studied respectively in the Cl - ion containing neutral solution. These compounds were the main grain boundary precipitates of LY12CZ aluminium alloy. For each compound, the variation of the corrosion potential with time, and the anodic polarization curves were measured. Besides, the corrosion morphology and the corrosion products were studied by SEM and EDAX. The results showed that the pitting corrosion occurred there in all the phase, among others the corrosion resistance of S phase was the poorest and the L1 phase was the best. The pitting resulted mainly from the anodic dissolution of Al and Mg. The corrosion products were mainly insoluble aluminium hydroxides,soluble aluminium chlorides and soluble magnisium salts. The Cu and Mn were cathode of the microelectrochemical cells during the pitting corrosion.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1997年第3期299-303,共5页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金
腐蚀与防护国家重点实验室资助
关键词
电化学腐蚀
晶间化合物
铝合金
electrochemical corrosion, intermetallic compounds, LY12CZ aluminium alloy
