THE STATES OF BROMIDE ON TITANIUM SURFACE PRIOR TO PIT INITIATION

J Chin Soc Corr Pro

1989, Vol. 9

Issue (1): 29-35 DOI:

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THE STATES OF BROMIDE ON TITANIUM SURFACE PRIOR TO PIT INITIATION

Meng Xiaōxiong and Huo Shizhong (Dalian Institute of Technology)

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Abstract The pit initiation process on commercially pure titanium in bromide solution was investigated by means of surface analysis.The results sho- wed that the titanium surface film formed by anodic polarization in bromide solution was mainly TiO_2.Prior to the pit initiation,Br- ions were adsorbed and accumulated on localized spots of the TiO_2 film forming Br nuclei containing mostly TiBr_4.The Br nuclei grew up into “critical nuclei”when the film was in the critical state of breaking down.The depth of the critical nuclei was equal to or less than 3nm. The concentration of Br in the critical nuclei was the critical surface concentration(CSC).It was the requisite condition for pit initiation that concentration of Br in Br nuclei reached CSC.In the system of titanium/bromide solution,the CSC(not measured in situ) was 25- 35wt% and was independent of the temperature and concentration of solution.

Received: 25 February 1989

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Meng Xiaōxiong and Huo Shizhong (Dalian Institute of Technology). THE STATES OF BROMIDE ON TITANIUM SURFACE PRIOR TO PIT INITIATION. J Chin Soc Corr Pro, 1989, 9(1): 29-35.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1989/V9/I1/29

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