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利用电化学极化曲线方法、交流阻抗谱(EIS)技术和扫描电子显微镜(SEM)研究了Fe44Cr16Mo16C18B6非晶合金涂层在不同浓度NaOH(质量分数为10%,20%,30%)溶液中的电化学腐蚀行为。电化学测试结果表明,Fe44Cr16Mo16C18B6非晶合金涂层在NaOH溶液中的阳极极化曲线出现了宽的钝化区,并且发生了二次钝化,钝化区随着NaOH溶液浓度的增大而变窄。EIS图谱由高频感抗弧和低频容抗弧构成,利用R(RL)(Q(R(CW)))等效电路模型能有效地解释此合金涂层的腐蚀性能。SEM观察发现,Fe44Cr16Mo16C18B6非晶合金涂层的表面腐蚀产物随着溶液浓度的增加而变厚,并伴有脱落的现象。
The electrochemical polarization curves, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were used to study the effects of Fe44Cr16Mo16C18B6 amorphous alloy coating on the concentration of NaOH (10%, 20%, 30% Electrochemical corrosion behavior. The results of electrochemical tests showed that the anodic polarization curve of Fe44Cr16Mo16C18B6 amorphous alloy coatings in NaOH solution showed a wide passivation zone and the secondary passivation occurred. The passivation zone changed with the concentration of NaOH solution narrow. The EIS spectrum is composed of a high-frequency inductive arc and a low-frequency capacitive arc. The R (RL) (Q (R (CW)) equivalent circuit model can effectively explain the corrosion behavior of this alloy coating. SEM observation showed that the surface corrosion products of Fe44Cr16Mo16C18B6 amorphous alloy coatings became thicker with the increase of solution concentration, accompanied by the phenomenon of shedding.