30CrMnSiA钢有机涂层电化学研究

目的研究30Cr Mn Si A钢零部件表面在只涂有1层H06-076底漆状态下的抗腐蚀能力。方法在试验过程中采用加速环境谱,利用电化学阻抗谱(EIS)方法研究30Cr Mn Si A钢试样表面在只涂有1层H06-076底漆状态下的腐蚀情况。结果涂有1层H06-076底漆的30Cr Mn Si A试样只经历了1个周期的加速环境谱就发生了腐蚀。电化学阻抗谱(EIS)方法测得的涂层失效与宏观观察到的基体金属腐蚀吻合较好。电化学阻抗谱(EIS)方法测得的10 Hz处相位角的变化规律与0.1Hz处阻抗模值的变化规律一致。结论 30Cr Mn Si A在只涂1层H06-076底漆的情况下其抗腐蚀性能很差,在外场大气环境中使用极易发生腐蚀。利用电化学阻抗谱(EIS)方法可有效表征有机涂层涂覆下的金属腐蚀行为并评估涂层的保护性能。

Study on Organic Coatings of 30CrMnSiA Steel by Electrochemical Methods

Objective To study the anti-corrosion of 30CrMnSiA parts coated with only a layer of H06-076 primer. Methods Accelerated environmental spectrums were applied in the test, and the corrosion of 30CrMnSiA steel samples that coated with only a layer of H06-076 primer was studied by electrochemical impedance spectrum (EIS) technology. Results Corrosion occurred in 30CrMnSiA samples that coated with a layer of H06-076 primer after one period of accelerated environment spectrums . The failure of coatings measured by EIS fitted the corrosion of base-metal was observed. The 10 Hz phase change rules were in accord with the |Z|0.1 Hz measured by the EIS. Conclusion The anti-corrosion of 30CrMnSiA with only a layer of H06-076 primer was pretty weak and was tend to be corroded in the atmospheric environment. Corrosion behavior of metal coated by organic coatings can be effectively characterized and the performance of the coating can be accessed by the EIS method.