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采用慢应变速率试验法(SSRT)就应变速率、极化电位及时效条件的影响等研究了8090铝锂合金薄板在3.5％氯化钠溶中的应力腐蚀行为。其应力腐蚀敏感性随应变速率和极化电位而变化,且存在一个最敏感的应变速率(1×10~(-6)s~(-1))和一个发生应力腐蚀的临界电位(—800 mV,SCE)。8090合金薄板在欠时数状态下对应力腐蚀最敏感,峰时效状态下次之。而过时数状态下则不敏感。根据实验结果和断口形貌特征,认为8090合金薄板的应力腐蚀为阳极活性通道机制,但在强烈渗氢情况下,氢可能成为应力腐蚀的主导因素。
The stress corrosion behavior of 8090 Al-Li alloy sheet in 3.5% sodium chloride solution was studied by using the slow strain rate test (SSRT) on the strain rates, polarization potentials and aging conditions. The sensitivity to stress corrosion changes with the strain rate and polarization potential, and there is one of the most sensitive strain rates (1 × 10 -6 s -1) and a stress corrosion potential (-800 mV, SCE). 8090 alloy sheet in the state due to the most sensitive to stress corrosion, peak aging state next time. The outdated state is not sensitive. According to the experimental results and the features of the fracture surface, it is considered that the stress corrosion of 8090 alloy sheet is the anode active channel mechanism. However, in the case of intense hydrogen penetration, hydrogen may be the predominant factor of stress corrosion.