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标题：Study of the behavior of Moroccan coin ½ DH in a simulated sweat solution and 3% NaCl
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作者：Elhadiri H. ; Chegdani K. ; Sobh M. 等
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2014
卷号：5
期号：5
页码：1557-1564
出版社：University of Mohammed Premier Oujda
摘要：The copper-nickel alloy is known for its good corrosion resistance in different environments. It also has good mechanical properties. This allo y has been used for the manufacture of coins for the first time in the United Kingdom in 1947 . In this work, we studied the behavior of one of the most used pieces of Moroccan currency (the coin of ½ DH type 2002) in different medium: acidic or neutral (artificial sweat, 3% N aCl and 3% NaCl at pH = 2). This coin is composed o f 75% copper and 25% nickel. The results showed by Ato mic Absorption Spectrophotometer and electrochemical measurements that the coin ½ DH resists in a neutral medium (artificial sweat and 3% NaCl). The amounts of Ni 2+ and Cu 2+ released after seven days of the two media is: [Cu 2+ ] (Sue ur Artific ial) = 37.8 mg / l [Ni 2+ ] (Sueur Artificial) = 11.9 mg / l, [Cu 2+ ] (3% NaCl) = 59.1 mg / l and [Ni 2+ ] (3% NaCl) = 16.1 mg / l. Therefore, its manipulation is not very dangerous. Against, in the solution of 3% NaCl at pH = 2, the quantity Ni 2 + and Cu 2 + released is significant, [Cu 2+ ] (3% NaCl) = 59.1 mg / l and [Ni 2+ ] (3% NaCl) = 16.1 mg / l. Furthermore, we found that the coin releases more copper than nickel in the three medium. This confirms the trend to substitute cupronickel alloy b y nickel or steel nickel coated.
关键词：Coins; Copper;nickel; Sweat; 3% NaCl; Corrosion