Cl~-浓度对0359铝合金在模拟海洋大气环境中腐蚀的影响

通过连续盐雾腐蚀实验对0359铝合金在模拟环境中进行了腐蚀研究,主要考查Cl-浓度对其腐蚀性能的影响,分析了腐蚀试样的表面形貌、腐蚀产物、点蚀深度和腐蚀失重。结果表明:Cl-浓度对0359铝合金的腐蚀具有明显的加速作用;腐蚀形貌以点蚀为主,随Cl-浓度增加,点蚀逐步扩展,点蚀深度和腐蚀失重分别由1%浓度时6.36μm、0.833 3 g/m2增加到9%浓度时的26.30μm和9.50 g/m2。以万宁地区户外暴露腐蚀失重为参考,该合金可满足海洋大气环境中10年以上的使用寿命。

Influence of Cl - Concentration on Corrosion Behavior of 0359 Aluminum Alloy in Simulated Marine Atmosphere Environment

The corrosion behavior of 0359 aluminum alloy was studied by salt spray corrosion test in the simulative environment. The influence of Cl- concentration on corrosion performance was investigated, and the surface morphology, corrosion products, pitting depth and mass loss of the corrosion sample were analyzed. The results showed that Cl - concentration has a significant role in accelerating corrosion of 0359 aluminum alloy. Pitting is the main morphology and enlarges with the increase of Cl - concentration. The values of pitting depth were 6.36 um and 26.30 um, and mass loss were 0. 8333 g/m2 and 9.50 g/m2 with the Cl - concentration of 1% and 9%. In reference of the mass loss of exposure outside in Wanning area, 0359 aluminum alloy can meet the service life of more than 10 years in the marine atmospheric environment.