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Effect of high temperature heat treatment on intergranular corrosion of AlMgSi(Cu) model alloy

机译：高温热处理对AlMgSi（Cu）模型合金晶间腐蚀的影响

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摘要

Copper containing 6000-series aluminium alloys may become susceptible to intergranular corrosion (IGC) as a result of improper thermomechanical processing. Effect of cooling rate after solution heat treatment on the corrosion behaviour of a model AlMgSi(Cu) alloy of nominal composition (wt%) 0.6 Mg, 0.6 Si, 0.2 Fe, 0.2 Mn and 0.1 Cu was investigated. Slow cooling rates were simulated by isothermal treatment for predetermined times in lower temperature baths immediately after solution heat treatment. Treatment for 10-100 s at temperatures below 400℃ introduced susceptibility to IGC. Longer heat treatment at the same temperatures introduced susceptibility to pitting. A corrosion resistant time zone was found between the zones of IGC and pitting at temperatures lower than 350℃. Quenching in water after solution heat treatment prevented IGC. IGC was related to microgalvanic coupling between the noble Q-phase (Al_4Mg_8Si_7Cu_2) grain boundary precipitates and the adjacent depleted zone. Pitting was attributed to coarse particles in the matrix. Possible mechanisms causing the corrosion resistant intermediate zone are discussed. The results indicate possible methods for obtaining increased corrosion resistance of similar alloys by proper thermal processing.
机译：由于不正确的热机械加工，含铜的6000系列铝合金可能容易受到晶间腐蚀（IGC）的影响。研究了固溶热处理后冷却速率对标称组成为0.6 Mg，0.6 Si，0.2 Fe，0.2 Mn和0.1 Cu的AlMgSi（Cu）模型合金腐蚀行为的影响。固溶热处理后，立即在低温浴中通过等温处理预定时间来模拟缓慢的冷却速率。在低于400℃的温度下处理10-100 s引起了对IGC的敏感性。在相同温度下进行更长的热处理会导致点蚀。在低于350℃的温度下，在IGC和点蚀之间发现了一个耐腐蚀的时区。固溶热处理后在水中淬火可防止IGC。 IGC与高贵Q相（Al_4Mg_8Si_7Cu_2）晶界沉淀物和邻近的贫化区之间的微电流耦合有关。点蚀归因于基质中的粗颗粒。讨论了导致耐腐蚀中间区的可能机理。结果表明，通过适当的热处理可获得提高相似合金耐腐蚀性的可能方法。

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