对氯间二甲苯酚消毒液对常用金属的腐蚀作用

Corrosion effct of PCMX disinfectant on commonly used decorative metallic materials

目的观察对氯间二甲苯酚(PCMX)消毒液对304不锈钢、6063铝合金和镀锌板等常用装饰金属的腐蚀作用。方法使用浓度为2.2 mg;L的PCMX消毒液对304不锈钢、6063铝合金和镀锌板进行每日1次喷洒,持续8周,采用数码相机、三维视频显微镜以及扫描电镜(SEM)进行宏观与微观腐蚀形貌观察;利用线性极化(LP)、电化学交流阻抗(EIS)等对腐蚀行为与机制进行电化学分析。结果PCMX消毒液处理后,3种金属皆发生局部腐蚀,局部腐蚀面积(m2)和腐蚀电流(I)顺序均为镀锌板>6063铝合金>304不锈钢,304不锈钢和6063铝合金的腐蚀电流先大幅下降再缓慢增大,镀锌板的腐蚀电流逐渐增大。结论PCMX水解可以产生Cl-,造成金属局部腐蚀发生,3种金属中304不锈钢耐蚀能力最强。

Objective To investigate the effect of PCMX disinfectant on the corrosion of 304 stainless steel,6063 aluminum alloy and galvanized sheet.Methods 304 stainless steel,6063 aluminum alloy and galvanized sheet were sprayed once a day for 8 weeks with PCMX disinfectant at a concentration of 2.2 mg;L,and the macroscopic and microscopic corrosion morphology were observed by digital camera,3D video microscope and scanning electron microscope(SEM).Electrochemical analysis of corrosion behavior and mechanisms were made using linear polarization(LP),electrochemical impedance(EIS).Results After the treatment of PCMX disinfectant,local corrosion occurred in all three metals.and the local corrosion area(m2)and corrosion current(I)were galvanized sheet>6063 aluminum alloy>304 stainless steel.The corrosion current of 304 stainless steel and 6063 aluminum alloy decreased greatly and then increased slowly,and the corrosion current of galvanized sheet gradually increased.Conclusion PCMX hydrolysis can produce Cl-,resulting in local corrosion of metals,304 stainless steel among the three metals has the strongest corrosion resistance.