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首页> 外文会议>Chinese Materialsonference >Corrosion Behavior Evolution of A7N01 Aluminum Alloys with Different Heat Treatments in the IGC Solution
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Corrosion Behavior Evolution of A7N01 Aluminum Alloys with Different Heat Treatments in the IGC Solution

机译：A7N01铝合金在IGC溶液中不同热处理的腐蚀行为演化

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摘要

Three different heat treatments, peak aging (T6), over-aging (T74) and retrogression and re-aging (RRA), were conducted for the A7N01 aluminum alloy respectively. The evolution of the corrosion behavior in the intergranular corrosion (IGC) solution of the three alloys was studied by electrochemical impedance spectroscopy (EIS) and morphology analysis. The results showed that corrosion pits were formed on the three alloys surfaces after 6 h immersion in IGC solution. The T6 alloy had obvious intergranular corrosion and the depths of corrosion pits decreased in the order T6 > RRA > T74. The EIS results showed that in the initial stage of the reaction, the Nyquist plot were composed by a high frequency capacitance loop and a low frequency inductive loop. After 6 h immersion the inductive loop still existed in T74 alloy, while it disappeared in the other two alloys and was replaced by a low frequency capacitance loop. In the initial stage of reaction, pitting corrosion sensitivity of T74 alloy was the smallest, RRA alloy was the second one, and T6 alloy was the highest one. The equivalent circuit results showed that when the immersion time was between 6 and 144 h, the polarization resistance (R_(pit)) increased gradually with the immersion time prolonging. The R_(pit) decreased in the order T6 > RRA > T74 alloy, which attribute to the formation of corrosion products on the new interface. In the later stage of the immersion (after 144 h), the R_(pit) of the three alloys decreased as a result of the abscission of the corrosion products on the alloy surface. After soaking for 168 h, the R_(pit) of T74 alloy reached the maximum value, RRA alloy was slightly higher than T6 alloy. In the late stage, the corrosion susceptibility to intergranular corrosion sensitivity decreased in the order T6 > RRA > T74.
机译：为A7N01铝合金进行三种不同的热处理，峰值老化（T6），过度老化（T74）和倒置和再衰老（RRA）。通过电化学阻抗谱（EIS）和形态分析研究了三种合金骨间腐蚀（IGC）溶液中腐蚀行为的演变。结果表明，在IGC溶液中6小时浸泡后，在三种合金表面上形成腐蚀坑。 T6合金具有明显的晶间腐蚀，并且腐蚀凹坑的深度在T6> Rra> T74中减少。 EIS结果表明，在反应的初始阶段，奈奎斯特图由高频电容回路和低频电感环组成。在6小时后，浸入到T74合金中仍然存在电感回路，而其在其他两个合金中消失，并被低频电容环代替。在反应的初始阶段，T74合金的蚀腐蚀敏感性最小，Rra合金是第二个，T6合金是最高的。等效电路结果表明，当浸渍时间在6至144小时之间时，偏振电阻（R_（坑））随着浸入时间延长而逐渐增加。 R_（PIT）在T6> RRA> T74合金的顺序下减少，归因于新界面上的腐蚀产品的形成。在浸渍的后期（144小时后），由于合金表面上的腐蚀产物脱落，三合金的R_（坑）降低。浸泡168小时后，T74合金的R_（坑）达到最大值，Rra合金略高于T6合金。在晚期，对晶间腐蚀性敏感性的腐蚀敏感性在T6> Rra> T74的顺序下降。

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