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目的为进一步深入理解铝合金点蚀行为提供理论支持,确定影响铝合金点蚀行为的微观结构因素。方法将铝合金材料于服役环境的点蚀行为视为受众多因素影响的随机过程,基于点蚀电化学腐蚀机理和常体积扩展模型,对影响铝合金点蚀行为因素进行定性和统计分析。结果从铝合金点蚀扩展模型可以看出,影响铝合金点蚀的微观结构因素包括铝合金材料微观组成粒子的尺寸、粒子密度以及微观组成粒子元素的类型。结论铝合金微观粒子尺寸和粒子密度都具有统计特性,可以采用相关分布函数对其分布特性进行统计分析,Cu和Fe粒子对铝合金点蚀行为影响较大。
OBJECTIVE To provide theoretical support for further understanding of pitting corrosion behavior of aluminum alloy and to determine the microstructure factors that affect the pitting corrosion behavior of aluminum alloy. Methods The pitting corrosion behavior of aluminum alloy in service environment was regarded as a stochastic process influenced by many factors. Based on the mechanism of pitting electrochemical corrosion and the volume expansion model, the influencing factors of pitting corrosion of aluminum alloy were qualitatively and statistically analyzed. Results From the pitting corrosion model of aluminum alloy, it can be seen that the microstructure factors that affect the pitting corrosion of aluminum alloy include the size of microscopic particles, the density of particles and the types of microscopic particles. Conclusions The microscopic particle size and particle density of the aluminum alloy all have statistical characteristics. The distribution function can be used to analyze the distribution characteristics of the aluminum alloy. Cu and Fe particles greatly affect the pitting corrosion behavior of the aluminum alloy.