Zn-2.0Al-1.5Mg镀层在模拟海洋大气中的腐蚀行为  

Corrosion Behavior of Zn-2.0Al-1.5Mg Coatings in Simulated Marine Atmosphere

作　　者：顾天真 刘雨薇[1,3] 彭灿 张鹏 王振尧[1,3] 汪川[1,3] 马成 曹宏玮 GU Tianzhen;LIU Yuwei;PENG Can;ZHANG Peng;WANG Zhenyao;WANG Chuan;MA Cheng;CAO Hongwei(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Liaoning Shenyang Soil and Atmosphere Corrosion of Materials National Observation and Research Station,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;HBIS Group Technology Research Institute,Shijiazhuang 050023,China)

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016 [3]中国科学院金属研究所辽宁沈阳土壤大气环境材料腐蚀国家野外科学观测研究站,沈阳110016 [4]河钢集团钢研总院,石家庄050023

出　　处：《金属学报》2025年第2期278-286,共9页Acta Metallurgica Sinica

基　　金：河北省自然科学基金项目,No.E2021318006。

摘　　要：为了推动Zn-2.0Al-1.5Mg镀层在腐蚀性较重的海洋大气环境下服役,本工作采用室内干/湿交替循环腐蚀试验(CCT)方法、腐蚀失重、SEM、XRD、EIS和动电位极化等手段,对Zn-2.0Al-1.5Mg镀层在模拟海洋大气中的腐蚀行为(腐蚀动力学、腐蚀产物演化、腐蚀形貌、电化学行为等)进行研究。结果表明:腐蚀168 h,腐蚀产物为Zn O,随着腐蚀时间的延长,腐蚀产物主要为Zn_(5)(OH)_(8)Cl_(2)·H_(2)O,到1848 h,腐蚀产物中还有少量的Zn(OH)_(2)·0.5H_(2)O;Zn O出现的主要原因之一是干/湿交替时间缩短,而Zn(OH)_(2)·0.5H_(2)O的出现与腐蚀后期Mg或Al元素的消耗有关。在模拟海洋大气中,Zn-2.0Al-1.5Mg镀层腐蚀速率随时间呈M型变化,腐蚀速率变化与腐蚀产物的演化密切相关。840 h前腐蚀速率大体呈上升趋势,仅在336~504 h阶段腐蚀速率减小,其原因可能与腐蚀产物Zn O的消失和Zn_(5)(OH)_(8)Cl_(2)·H_(2)O的比例增多有关。As the service environment changes,the widely used galvanized coating faces challenges due to its overly thick coating and insufficient corrosion resistance.Zn-2.0Al-1.5Mg coatings have emerged as an alternative to conventional galvanizing because of their excellent corrosion resistance and are extensively used in buildings,home appliances,and automobiles in harsh environments.The marine environment,known for its high corrosiveness,faces considerable material corrosion problems.Highly resistant materials,such as Zn-2.0Al-1.5Mg coating,stainless steel,have found applications in the marine environment.However,the development period of Zn-2.0Al-1.5Mg coating is short,and further research is required to determine its suitability for highly corrosive marine atmospheric environments.Consequently,the laboratory dry-wet alternating cycle corrosion test method,corrosion mass loss,SEM,XRD,EIS,and potentiodynamic polarization were used to investigate the corrosion behavior(e.g.,corrosion kinetics,corrosion product evolution,corrosion morphology,and electrochemical behavior)of Zn-2.0Al-1.5Mg coatings in a simulated marine atmosphere.Results show that the initial corrosion product is Zn O at 168 h,with Zn_5(OH)_8Cl_2·H_(2O)appearing after 168 h of corrosion cycles(336,504,672,840,and 1848 h).The emergence of Zn O at 168 h is attributed to the shortened dry-wet alternating cycle time,while that of Zn(OH)_2·0.5H_(2O)at 1848 h is attributed to the depletion of Mg or Al elements.The corrosion rate of Zn-2.0Al-1.5Mg coatings in the simulated marine atmosphere exhibited an M-shaped curve over time,closely related to the evolution of corrosion products.Between 0 and 840 h,the corrosion rate increased,except for a decrease between 336 and 504 h;this trend may be attributed to the disappearance of Zn O and an increase in the amount of Zn_5(OH)_8Cl_2·H_2O.Combined with the electrochemical results,it is speculated that the corrosion will accelerate with further exposure after 1848 h.

关 键 词：Zn-2.0Al-1.5Mg镀层 海洋大气 大气腐蚀 腐蚀产物演化 

分 类 号：TG172.3[金属学及工艺—金属表面处理]