STRESS CORROSION OF Sn CONTAINING 70/30 BRASS IN DISTILLED WATER AND MATTSSON SOLUTION

J Chin Soc Corr Pro

1992, Vol. 12

Issue (1): 11-19 DOI:

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STRESS CORROSION OF Sn CONTAINING 70/30 BRASS IN DISTILLED WATER AND MATTSSON SOLUTION

Zhang Meihua and Yu jian (Shanghai Research Institute of Materials)

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Abstract The susceptibility of 70/30 brass with various Sn contents in the range from 0.1% to 2% to stress corrosion cracking (SCC) in distilled water (applied potential of OV, SCE) and Mattsson solution(pH7. 2,open circuit condition) subjected to slow strain-rate test(SSRT)was investigated. The results showed that 70/30 brass containing 0.4％ Sn exhibited optimum resistance to SCC in distilled water, while in Mattsson solution the resistance to SCC increased with the increases of Sn content. The addition of Sn was in favour of the transition to transgranular cracking from intergranular cracking in the brass. The analysis of the test solution indicated that the primary effect of Sn upon the inhibition of the SCC of 70/30 brass was due to its effect upon the surpression of dezincification. It was unable to evaluate the susceptibility of the brass to SCC in Mattsson solution by the conventional dezincification coefficient as the inherent copper ions in the solution were deposited by reduction during the SCC process. In this case,a reasonable agreement was found between its zinc dissolution rate per unit area and the average crack propagation rate.

Received: 25 February 1992

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Zhang Meihua and Yu jian (Shanghai Research Institute of Materials). STRESS CORROSION OF Sn CONTAINING 70/30 BRASS IN DISTILLED WATER AND MATTSSON SOLUTION. J Chin Soc Corr Pro, 1992, 12(1): 11-19.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I1/11

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