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研究Al-Cu-Li合金AA2195在3.5% NaCl环境中的耐蚀和抗裂性能,并将其与另一高强合金AA2219进行比较。采用浸泡腐蚀和恒电位极化实验测定合金的总耐蚀性能;采用低应变速率测试法确定合金的应力腐蚀开裂(SCC)性能。利用SEM-EDS和光学测量技术对合金样品进行表征以研究其腐蚀形貌、元素含量和腐蚀深度的变化。用韧性的减少量作为估算合金应力腐蚀开裂(SCC)敏感性的一个参数。结果表明,由于较低的腐蚀速率、较小的腐蚀深度和宽度,AA2195合金比AA2219合金具有更好的耐蚀性能。然而,两种合金的SCC参数(ε_(NaCl)/ε_(air))均大于0.90,说明此两种合金均具有较好的抗裂性能。断裂样品的SEM-EDS结果表明,两种合金均为典型的脆性断裂形貌。
The corrosion and crack resistance of Al-Cu-Li alloy AA2195 in 3.5% NaCl environment was studied and compared with another high-strength alloy AA2219. The total corrosion resistance of the alloy was determined by immersion corrosion and potentiostatic polarization experiments. The SCC properties of the alloy were determined by low strain rate test. The alloy samples were characterized by SEM-EDS and optical measurement techniques to study the changes of their corrosion morphology, element content and corrosion depth. The reduction in toughness is used as a parameter to estimate the sensitivity of the alloy to stress corrosion cracking (SCC). The results show that the AA2195 alloy has better corrosion resistance than the AA2219 alloy due to its lower corrosion rate and smaller corrosion depth and width. However, the SCC parameters (ε NaCl / ε air) of the two alloys are all greater than 0.90, indicating that both alloys have good crack resistance. The SEM-EDS results of the fractured samples show that both alloys are typical brittle fracture morphology.