论文部分内容阅读
在海洋和工业大气环境中对纯Al 8A06进行为期20 a的现场暴露实验,利用电子探针(EMPA)、波谱仪(WDS)和电化学阻抗(EIS)对腐蚀产物的形貌、元素组成和极化电阻Rp进行了分析和测试。结果表明,在两种大气环境中纯Al 8A06的腐蚀产物均主要由Al,O和S组成,但其腐蚀速率在工业大气环境下的约为海洋大气环境的1.5倍。在0.6 mol/L Na_2SO_4溶液中,极化电阻Rp从大到小顺序为:海洋大气环境中暴露20 a的试样>工业大气环境中暴露20 a的试样>8A06基体,这说明在海洋大气环境中腐蚀产物对基体的保护作用比工业大气环境中更好。
A 20-day field exposure experiment was performed on pure Al 8A06 in marine and industrial atmospheres. The morphology, elemental composition, and composition of the corrosion products were characterized using electron probe (EMPA), spectroscopy (WDS) and electrochemical impedance spectroscopy (EIS) Polarization resistance Rp was analyzed and tested. The results show that the corrosion products of pure Al 8A06 are mainly composed of Al, O and S in the two atmospheric environments, but the corrosion rate is about 1.5 times that of the marine atmospheric environment in the industrial atmosphere. In 0.6 mol / L Na_2SO_4 solution, the order of polarization resistance Rp is as follows: sample exposed to 20 a in the marine atmosphere> sample exposed to 20 a in the industrial atmosphere> 8A06 matrix, indicating that in the marine atmosphere Corrosion products in the environment to protect the substrate better than the industrial atmosphere.