Synergistic effect of CeCl3 and benzotriazole on corrosion resistance of naturally aged and artificially aged AA2024 aluminium alloy  

CeCl3和苯并三唑对自然时效和人工时效AA2024铝合金耐蚀性的协同效应

作　　者：Bore JEGDIĆ Biljana BOBIĆ Bojana RADOJKOVIĆ Jovanka KOVAČINA Dunja MARUNKIĆ Bore JEGDIC;Biljana BOBIC;Bojana RADOJKOVIC;Jovanka KOVACINA;Dunja MARUNKIC(University of Belgrade,Institute for Chemistry,Technology and Metallurgy,Belgrade,Serbia)

机构地区：[1]University of Belgrade,Institute for Chemistry,Technology and Metallurgy,Belgrade,Serbia

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第6期1478-1490,共13页中国有色金属学报（英文版）

基　　金：financially supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant No. 451-03-68/2020-14/200026)

摘　　要：The corrosion behaviours of naturally aged and artificially aged AA2024 aluminium alloys in 0.5 mol/dm3 NaCl solution in the presence of environmentally friendly corrosion inhibitors of 10 mmol/dm3 CeCl3, 10 mmol/dm3 BTA and the inhibitor mixture (5 mmol/dm3 CeCl3 + 5 mmol/dm3 BTA) were analyzed. The goal of this work was to determine the level of the synergistic effect of the inhibitor mixture and to explain the nature of this effect. Corrosion properties of the inhibitor layer were studied using the electrochemical impedance spectroscopy (EIS), while the resistance to pit formation and pit growth was studied by applying potentiodynamic polarisation tests. The results of scanning electron microscopy (SEM/EDS) showed that the size of pits formed in naturally aged aluminium alloy was smaller than that formed in artificially aged alloy. The synergistic effect of the inhibitor mixture on corrosion properties of naturally aged alloy was observed throughout 96 h, and in later phases of testing of artificially aged alloy. The synergistic effect of the inhibitor mixture was not noticed on pit formation and pit growth.分析自然时效和人工时效AA2024铝合金在0.5 mol/dm3 NaCl溶液中的腐蚀行为,溶液中分别加入环境友好的缓蚀剂:10 mmol/dm3 CeCl3,10 mmol/dm3 BTA和5 mmol/dm3 CeCl3+5 mmol/dm3 BTA混合缓蚀剂。本研究的目的是确定混合缓蚀剂的协同效应水平,并解释这种效应的本质。采用电化学阻抗谱(EIS)研究缓蚀剂层的腐蚀性能,通过动电位极化试验研究其抑制点蚀形成和点蚀生长的能力。扫描电子显微镜(SEM/EDS)的结果表明,自然时效铝合金中形成的点蚀尺寸小于人工时效合金中形成的点蚀尺寸。在自然时效合金测试的96 h内以及在人工时效合金测试的后期,均观察到混合缓蚀剂对腐蚀性能的协同效应,但没有发现混合缓蚀剂对点蚀形成和点蚀生长的协同效应。

关 键 词：aluminium alloy pitting corrosion corrosion inhibitor CERIUM BENZOTRIAZOLE 

分 类 号：TG156.92[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]