Simultaneous visualization of pH and Cl- distributions inside the crevice of stainless steel
Simultaneous visualization of pH and Cl- distributions inside the crevice of stainless steel
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DOI：
10.1016/j.corsci.2016.01.028
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发表时间：
2016-05-01
影响因子：
8.3
通讯作者：
Hara, Nobuyoshi
中科院分区：
文献类型：
--
作者：
Nishimoto, Masashi;Ogawa, Junichiro;Hara, Nobuyoshi
研制了一种同时测量pH和Cl-浓度的敏感板。铽-吡啶二羧酸络合物（Tb-DPA）和硫酸奎宁分别用于测量pH和Cl-浓度。在缝隙腐蚀孕育期内，缝隙内pH值从3.0逐渐下降到约1.0。2.0，Cl-浓度从0.01增加到约2.0。0.18 M.微坑的产生导致pH急剧下降至0.5以下，Cl-浓度增加至4 M以上。这种情况允许缝隙腐蚀继续进行而不会自发停止。(C)2016作者爱思唯尔有限公司出版
A sensing plate for the simultaneous measurements of pH and Cl- concentration was fabricated. Terbium-dipicolinic acid complex (Tb-DPA) and quinine sulphate were used to measure the pH and Cl- concentration, respectively. In the incubation period of the crevice corrosion, the pH inside the crevice gradually decreased from 3.0 to ca. 2.0, and the Cl- concentration increases from 0.01 to ca. 0.18 M. The generation of the micro-pit led to a sharp decrease in pH to below 0.5 and an increase in the Cl- concentration to above 4 M. This situation allowed the crevice corrosion to proceed without spontaneously stopping. (C) 2016 The Authors. Published by Elsevier Ltd.