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采用电偶腐蚀测量、动电位极化曲线测量和电化学阻抗测量等技术研究了纯Cr在固态NaCl和水蒸汽协同作用下的腐蚀机制.结果表明:纯Cr在该腐蚀环境中发生电化学腐蚀,而电化学腐蚀在腐蚀总量中所占的比重很小.但是,纯Cr的腐蚀是电化学腐蚀反应耦合一个前置的化学腐蚀反应的过程,即纯Cr首先与固态NaCl和水蒸汽发生化学腐蚀反应产生气态HCl,生成的气态HCl再参与电化学腐蚀反应生成H2.电化学腐蚀反应的发生促进了化学腐蚀反应的进行,从而加速了纯Cr的腐蚀.
The corrosion mechanism of pure Cr under the synergistic action of solid NaCl and steam was studied by using galvanic corrosion measurement, potentiodynamic polarization curve measurement and electrochemical impedance measurement.The results show that pure Cr is electrochemically corroded in this corrosion environment , While the proportion of electrochemical corrosion in the total amount of corrosion is very small.However, the corrosion of pure Cr is a chemical corrosion reaction coupled with a pre-chemical corrosion reaction process, that is, pure Cr first with solid NaCl and water vapor The chemical corrosion reaction generates gaseous HCl, and the generated gaseous HCl then participates in the electrochemical corrosion reaction to generate H2. The occurrence of electrochemical corrosion reaction accelerates the chemical corrosion reaction and accelerates the corrosion of pure Cr.