采用慢应变速率拉伸试验方法研究了6082铝合金板材在不同温度下的抗应力腐蚀性能,采用光学显微镜和透射电镜观察其显微组织,采用扫描电镜对其进行断口分析.结果表明:6082铝合金板材在70℃,3.5%(体积分数)NaCl溶液中的应力腐蚀敏感性指数为6.6%,在50℃,3.5%(体积分数)NaCl溶液中的应力腐蚀敏感性指数为2.3%;试样断口均无应力腐蚀特征,合金晶内析出了弥散分布的细小 Mg2Si相,晶界析出了不连续分布的 Mg2Si相,不能形成连续的沿晶腐蚀通道,试样表现为较好的抗应力腐蚀性能;温度升高使试样在腐蚀溶液中的抗拉强度下降幅度较大,试样在70℃下的应力腐蚀敏感性指数偏高.
The slow strain rate tensile test method was used to study the stress corrosion resistance of 6082 aluminum alloy sheet at different temperatures.The microstructure was observed using optical microscopy and transmission electron microscopy,and the fracture surface was analyzed using scanning electron microscopy.The results show that the stress corrosion sensitivity index of 6082 aluminum alloy sheet was 6.6%in a 3.5%(volume fraction)NaCl solution at 70℃,and 2.3%in a 3.5%(volume fraction)NaCl solution at 50℃.The fracture surfaces of the samples showed no stress corrosion characteristics,and dispersed small Mg2Si phases were precipitated within the alloy grains,while discontinuous Mg2Si phases were precipitated at the grain boundaries,which could not form continuous intergranular corrosion channels.The samples exhibited good stress corrosion resistance.The increased in temperature led to a significant decrease in the tensile strength of the sample in the corrosive solution,resulting in a higher stress corrosion sensitivity index of the sample at 70℃.
王建军;罗先甫;刘煜;王佳;孙绪鲁;查小琴
中车青岛四方机车车辆股份有限公司, 青岛 266031中国船舶集团有限公司第七二五研究所, 洛阳 471023中国船舶集团有限公司第七二五研究所, 洛阳 471023||河南省船舶及海工装备结构材料技术与应用重点实验室, 洛阳 471023
6082铝合金;慢应变速率拉伸试验;应力腐蚀敏感性指数;钝化膜
6082 aluminum alloy;slow strain rate tensile test;stress corrosion sensitivity index;passive film
《理化检验-物理分册》 2024 (003)
16-19,22 / 5
10.11973/lhjy-wl202403004
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