Development of measurement system for ph distribution on metal surface under atmospheric corrosion

IF 0.5 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Journal of The Japan Institute of Metals Pub Date : 2017-09-25 DOI:10.2320/JINSTMET.JAW201704
Youhei Hirohata, Kentaro Nishida, T. Haruna, K. Noda
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引用次数: 2

Abstract

Thin water film is formed on metal surfaces that are exposed to the atmosphere. The conditions of this film change according to environmental factors, such as temperature, wind, and rainfall. Hence, it is difficult to investigate atmospheric corrosion on metal surfaces.This paper aimed to develop a measurement system for the pH distribution on a metal surface in simulated atmospheric envi -ronment. The surface pH distribution was measured with agar film including pH indicators and MgCl 2 . The pH indicators used were a universal indicator and an MR ︲ BTB indicator. Agar film of 0 . 5 mm thickness was placed on an iron specimen. The specimen was set in a chamber with a relative humidity of 100 % to prevent the agar film from drying out. The surface pH distribution was deter - mined from the color of the agar film with an RGB color model. The surface pH distribution on the iron showed that anodic reac tions produced acidic regions and cathodic reactions produced basic regions. The observed phenomena were the same as that found under a water droplet which contained the pH indicator and MgCl 2 . Therefore, we conclude that the agar film could simulate thin water film in an atmospheric environment and allow measurement of the surface pH distribution on iron under corro sion.
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大气腐蚀下金属表面ph分布测量系统的研制
暴露在大气中的金属表面会形成一层薄薄的水膜。这种薄膜的条件根据环境因素,如温度、风和降雨而变化。因此,研究大气对金属表面的腐蚀是困难的。本文旨在研制一种模拟大气环境下金属表面pH值分布的测量系统。用琼脂膜(含pH指示剂和氯化镁)测定表面pH分布。使用的pH指示剂为通用指示剂和MR︲BTB指示剂。琼脂膜0。在铁试样上放置5mm的厚度。将标本置于相对湿度为100%的室中,以防止琼脂膜变干。用RGB颜色模型测定了琼脂膜的表面pH值分布。铁表面的pH分布表明,阳极反应产生酸性区,阴极反应产生碱性区。所观察到的现象与在含有pH指示剂和mgcl2的水滴下发现的现象相同。因此,我们得出结论,琼脂膜可以模拟大气环境中的薄水膜,并可以测量铁在腐蚀下的表面pH分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of The Japan Institute of Metals
Journal of The Japan Institute of Metals 工程技术-冶金工程
CiteScore
0.70
自引率
0.00%
发文量
27
审稿时长
6-12 weeks
期刊介绍: Information not localized
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