钒酸盐缓蚀剂的有效氧化态及其在致钝过程中的速度控制步骤

中国腐蚀与防护学报

1990, Vol. 10

Issue (1): 43-50

研究报告

本期目录 | 过刊浏览

钒酸盐缓蚀剂的有效氧化态及其在致钝过程中的速度控制步骤

周本省;李国华

南京化工学院;天津大学材料系

THE EFFECTIVE OXIDATION STATE OF VANADATE CORROSION INHIBITOR AND ITS RATE-DETERMINING STEP IN THE PASSIVATION PROCESS OF METALS

Zhou Bensheng Li Guohua (Nanjing Institute of Chemical Technology)

全文: PDF(732 KB)

摘要: 作者在下列腐蚀体系中:(1)000 Cr17Ti 不锈钢在 H_2SO_4溶液中,(2)碳钢在一乙醇胺溶液中和(3)TC4钛合金在 H_2SO_4溶液中,用旋转电极电位滴定法研究了钒酸盐缓蚀剂的有效氧化态。结果发现,钒酸盐缓蚀剂的有效氧化态是+5,且各种五价钒化合物之间是等效的。通过钒酸盐临界致钝浓度与旋转圆盘电极转速关系的研究,作者确定了:(1)钛合金的致钝过程是由钒酸盐向钛合金电极表面的扩散过程所控制;(2)钒酸盐在钛合金表面进行的阴极反应中获得的电子数为1。

Abstract：The effective oxidation state of vanadate corrosion inhibitor is determined by rotating disk electrode(RDE)potentiometric titration using NaVO_3 and/or VOSO_4 respectively in the following deaerated aqueous solutions:(1)stainless steel in 0.5MH_2 SO_4,(2)mild steel in CO_2-saturated 20% monoethanolamine solution,and (3)titanium alloy in 3.0MH_2 SO_4.It is found that NaYO_3,as a compound of pentapositive vanadium,can passivate these active-passive metals,but VOSO_4,as a compound of quadripositive vanadium,can not,so the effective oxidation state of vanadate corrosion inhibitor in aqueous solutions is+5,not +4.It is also found that as an oxidizing inhibitor,various compounds of pentapositive vanadium are equivalent in passivation process of metals. The variation of critical passivation concentration of NaVO_3 to ω~(-1,2)(ω-angular velocity of RDE) indicates that the passivation process of titanium alloy is determined by the diffusion rate of NaVO_3 in H_2 SO_4 solutions and one electron reduction to quadripositive vanadium takes place at the surface of titanium alloy.

收稿日期: 1990-02-25

基金资助:国家自然科学基金

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引用本文:

周本省;李国华. 钒酸盐缓蚀剂的有效氧化态及其在致钝过程中的速度控制步骤[J]. 中国腐蚀与防护学报, 1990, 10(1): 43-50.
. THE EFFECTIVE OXIDATION STATE OF VANADATE CORROSION INHIBITOR AND ITS RATE-DETERMINING STEP IN THE PASSIVATION PROCESS OF METALS. J Chin Soc Corr Pro, 1990, 10(1): 43-50.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1990/V10/I1/43

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