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| THE MECHANISM OF ARSENIC IN INHIBITING DEZINCIFICATION OF BRASS |
| Gan Fuxing Guo Hai Yao Luan (Wuhan University) |
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Abstract The inhibiting effect of arsenic on dezincffication of CuZn32 and CuZn38 alloys in 1% CuCl_2 solution has been investigated by means of immersion,electrochemical and sur- face analysis techniques.Experimental results show that the effects of various states of ar- senic on dezincification are different.The arsenious ion in medium has no influence on dezincification.The electrodeposited arsenic as a protective coating on brass can prevent dezincification.The surface-impregnated As formed through ion beam bombardment has similar effect on dezincification as electrodeposited As.The As as bulk-alloying additive has obvious effect on inhibiting dezincification.The relationship of dezincification depth to the content of As in brass follows an empirical equation:D=D_0/(1+B·C~n). It was found that a black film forms oh the surface of brass containing As in 1% CuCl_2 solution.This black film which has been shown to be composed of CuCl by XPS and AES has a protective effect on dezinceification.Based on the experimental results an action mechanism of As in inhibiting dezincification can been proposed:As in brass may decrease the over-voltage of the reaction Cu~(2+)→CuCl and raise the over-voltage of the reaction Cu~(2+)→Cu~0.So the insoluble CuCl film can form on the surface of brass contain- ing As and prevent dezincification.
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Received: 25 February 1991
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[1]#12
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