温度对镁合金牺牲阳极材料电化学行为的影响研究  

Effects of Temperature on Electrochemical Behaviors of Magnesium Sacrificial Anodes

作　　者：李慧[1] 孙雨来[1] 杨立华[1] 刘婷 邱于兵[2] LI Hui;SUN Yu-lai;YANG Li-hua;LIU Ting;QIU Yu-bing(Changqing Oil and Gas Technology Institute,PCOC,Xi'an 710021,China;School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中国石油长庆油田分公司油气工艺研究院,西安710021 [2]华中科技大学化学与化工学院,武汉430074

出　　处：《装备环境工程》2019年第11期64-68,共5页Equipment Environmental Engineering

摘　　要：目的研究温度对常用镁合金阳极材料MIC、AZ31、AZ63电化学行为的影响。方法根据GB/T 17848-1999,采用四天加速试验法,在25~70℃的人造海水介质中进行阳极电化学性能评价,并观察腐蚀后阳极的宏观腐蚀形貌。采用极化曲线测试技术,研究温度对加速试验前后阳极的极化行为影响。结果随着温度的升高,三种镁阳极的局部腐蚀明显加剧,溶解状态逐渐变得不均匀。随着温度的上升,三种镁阳极的实际电容量和电流效率呈小幅增加趋势,温度的影响不显著。极化曲线显示,镁阳极表现出活化溶解特征,温度升高明显促进了镁阳极的阴极过程,自腐蚀速率逐渐增加。结论在腐蚀初期,温度升高明显促进了镁合金阳极的腐蚀过程,但对镁阳极的电化学性能影响不显著,这可能与后期腐蚀产物生成以及表面状态的变化有关。Objective To study on the effect of temperature on the electrochemical behaviors of magnesium sacrificial anodes MIC,AZ31 and AZ63.Methods According to GB/T 17848-1999 standard,the electrochemical performance of three types of commercial magnesium sacrificial anodes were evaluated in artificial sea water at 25-70℃by the four-day acceleration method.The macrocorrosion morphology of the anode after corrosion was observed;the polarization behaviors of the anodes before and after the four-day acceleration test were studied with the polarization curve measuring and testing technique.Results With the increase of temperature,the local corrosion of the anodes became more serious,making their dissolution state non-homogeneous.The effective current capacities and current efficiencies of the anodes increased slightly with T.The temperature had no significant influence.The polarization curves of the anodes indicated that magnesium anode displayed active dissolution state.With the increase of temperature,the cathodic process of magnesium anode was promoted largely to increase their corrosion rates.Conclusion The increasing T accelerates the corrosion of these anodes in their initial corrosion period,but its effect on their electrochemical performance is not obvious,which may be related to the corrosion products on the Mg anodes and the change of their surface conditions with the proceed of corrosion.

关 键 词：镁合金 牺牲阳极 温度 电化学性能 人造海水 

分 类 号：TG172.5[金属学及工艺—金属表面处理]