7475-T761 铝合金的机械性质上的优先的腐蚀的效果被沉浸测试,压力腐蚀测试,阴极充电方法和电气化学的极化测试调查。结果与 3 在答案显示出那优先的腐蚀 ?wt% NaCl 并且 0.5 ?wt% H < 潜水艇 class= “ a-plus-plus ” > 2 O < 潜水艇 class= “ a-plus-plus ” > 2 导致 7475-T761 的机械性质恶化铝合金。而且,延伸显著地减少。这主要被归因于电气化学的腐蚀和氢 embrittlement,腐蚀在起一个主要作用。张力的应力由加速 pitting 腐蚀和氢 embrittlement 支持机械性质的降级。
The effect of prior corrosion on the mechanical properties of 7475-T761 aluminum alloy was investigated by immersion test, stress corrosion test, cathode charge method and electrochemical polarization test. Results show that prior corrosion in the solution with 3 wt% NaC1 and 0.5 wt% H202 leads to mechanical properties deterioration of 7475-T761 aluminum alloy. Moreover, the elongation decreases significantly. This is mainly attributed to electrochemical corrosion and hydrogen embrittlement, in which corrosion plays a major role. Tensile stress promotes the degradation of the mechanical properties by accelerating the pitting corrosion and hydrogen embrittlement.