沉船原址保护金属框用两种Al-Zn-In系牺牲阳极的电化学性能及其影响因素  

Electrochemical Property of Two Al-Zn-In Aluminum Alloy Sacrificial Anodes Used for Conservation of Shipwreck and Its Influence Factors

作　　者：吴玉清[1,2] 吴进贤 王菊琳[1,2] 席光兰 WU Yuqing;WU Jinxian;WANG Julin;XI Guanglan(Beijing Key Laboratory of Electrochemical Process and Technology for Materials,Beijing University of Chemical Technology,Beijing 100029,China;Key Research Base of State Administration of Cultural Heritage for Evaluation of Science and Technology in Cultural Relics Protection Field,Beijing 100029,China;National Center for Archaeology,Beijing 100013,China)

机构地区：[1]北京化工大学材料电化学过程与技术北京市重点实验室,北京100029 [2]文物保护领域科技评价研究国家文物局重点科研基地,北京100029 [3]国家文物局考古研究中心,北京100013

出　　处：《腐蚀与防护》2021年第10期49-53,60,共6页Corrosion & Protection

基　　金：国家重点研发计划(2020YFC 1522100)。

摘　　要：从化学成分、显微组织、腐蚀形貌和自腐蚀行为等方面探讨了两种用于古沉船原址保护金属框阴极保护的Al-Zn-In系牺牲阳极在自放电性能上产生差异的主要原因。结果表明:相较于2号铝合金牺牲阳极,1号铝合金牺牲阳极具有更高的电流效率。铝合金腐蚀速率、表面腐蚀产物脱落行为不会对两种牺牲阳极的自放电性能产生明显影响,2号铝合金牺牲阳极在腐蚀过程中明显的晶粒脱落是导致其自放电性能明显下降的主要原因,这一现象可能与晶界处富Ti沉积相的存在有关。In terms of chemical composition,microstructure,corrosion morphology and self-corrosion behavior,the main reasons for the difference in self-discharge performance of two Al-Zn-In sacrificial anodes used for the cathodic protection of the metal frame of an ancient shipwreck in-situ protection were discussed.The results show that:compared with No.2aluminum alloy sacrificial anode,No.1aluminum alloy sacrificial anode had higher current efficiency.The corrosion rate of aluminum alloy and the shedding behavior of surface corrosion products would not significantly affect the self-discharge performance of the two sacrificial anodes.The obvious grain shedding of No.2 aluminum alloy sacrificial anode during the corrosion process was the main reason for the obvious decline of its selfdischarge performance.This phenomenon might be related to the existence of Ti-rich deposition phases at the grain boundaries.

关 键 词：铝合金 牺牲阳极 电化学测试 

分 类 号：TG174.2[金属学及工艺—金属表面处理]