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利用模拟海洋大气环境的加速腐蚀实验,对比研究了两种结构钢(低碳铁素体钢和耐候钢09CuPCrNi)朝天面与朝地面的腐蚀行为及相应锈层,结果表明两种结构钢的朝地面均比朝天面腐蚀严重。电化学阻抗谱(EIS)结果表明朝天面锈层对氯离子的阻碍能力高于朝地面锈层,X射线衍射(XRD)结果表明朝天面锈层中X射线无定形锈含量高于朝地面锈层,N2吸附结果表明朝天面锈层比朝地面锈层致密。两面腐蚀条件的差异造成了两面锈层相组成和致密度的不同,从而导致相应锈层保护性能的区别。提出锈层孔隙模型,解释了锈层保护性能差异的原因是锈层干/湿交替频率的不同。
The corrosive behaviors of the two structural steels (low-carbon ferritic steels and weathering steels 09CuPCrNi) towards the sky and toward the ground and the corresponding rust layers were studied by means of accelerated corrosion experiments simulating the marine atmosphere. The results show that the two structural steels The ground is more corroded than the sky. The results of electrochemical impedance spectroscopy (EIS) showed that the ascending surface rust layer was more resistant to chloride ions than the rust layer toward the ground surface. The XRD results showed that the X-ray amorphous rust content in the ascending surface rust layer was higher than that on the ground surface Layer, N2 adsorption results showed that the rust facing the ascending surface is denser than the rust facing the ground. The difference between the corrosion conditions on both sides caused the differences in the composition and density of the two rust layers, which led to the difference in the protective performance of the corresponding rust layers. The rust pore model was proposed to explain the difference in rust protection performance due to the difference in alternating dry / wet rust frequency.