孔蚀发生前溴在钛表面上的状态

中国腐蚀与防护学报

1989, Vol. 9

Issue (1): 29-35

研究报告

本期目录 | 过刊浏览

孔蚀发生前溴在钛表面上的状态

孟晓雄;火时中

大连工学院;航天部707研究所;大连工学院

THE STATES OF BROMIDE ON TITANIUM SURFACE PRIOR TO PIT INITIATION

Meng Xiaōxiong and Huo Shizhong (Dalian Institute of Technology)

全文: PDF(829 KB)

摘要: 本工作应用表面分析技术研究了工业纯钛在溴化钠溶液中的孔蚀引发过程。研究结果表明,工业纯钛在溴化钠溶液中用阳极极化法形成的膜的主要成份是二氧化钛。在孔蚀发生前,Br~-在二氧化钛膜上局部地区吸附并富集,形成以四溴化钛为主的 Br 核。当钝化膜处于即将破裂的临界状态时,Br 核成长为临界核的深度等于或小于3nm,核中 Br 浓度为临界表面浓度。Br 核中浓度达到临界表面浓度是孔蚀引发的必要条件。对于工业纯钛/溴化钠溶液体系,临界表面浓度的“离位(out situ)”数据为25～35wt%。此值不受溶液温度和浓度的影响.

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.

收稿日期: 1989-02-25

基金资助:国家自然科学基金会

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引用本文:

孟晓雄;火时中. 孔蚀发生前溴在钛表面上的状态[J]. 中国腐蚀与防护学报, 1989, 9(1): 29-35.
. 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/CN/ 或 https://www.jcscp.org/CN/Y1989/V9/I1/29

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