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Abstract The antitarnish effects of various antitarnish agents of copper have been compared in this paper.The results showed that the l-pheny1-5-mercaptotetrazole (PMTA) is a more excellent antitarnish agent than the Benzotriazole (BTA), Hydroxybenzoiri azole(HBT), 2-mercapto-benzothiazole (MBT).The optimum conditions of treating copper with PMTA are PMTA 1～1.2g/L, pH5, 20～40℃, 4min. The results of XPS and AES analyses showed that the coordination compound film of PMTA on copper surface was formed on Cu_2O, the valence state of copper in this film was+1.The N (1s) and S (2p) in PMTA molecule have been coordinated onto Cu_2O.The relative atomic percent contents (A.C.%) of the composition elements on the film were determined from the constant composition region of the depth profile curves as: Cu 40.9, C 32.3, N 16.2,O 7.9, S 2.9.
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Received: 25 August 1989
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