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首页> 外文期刊>Corrosion science >THE TEMPERATURE-DEPENDENCE OF THE SO_2-INDUCED ATMOSPHERIC CORROSION OF ZINC; A LABORATORY STUDY
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THE TEMPERATURE-DEPENDENCE OF THE SO_2-INDUCED ATMOSPHERIC CORROSION OF ZINC; A LABORATORY STUDY

机译：SO_2诱导的锌大气腐蚀的温度依赖性实验室研究

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摘要

The SO_2-induced atmospheric corrosion of zinc was studied at 4, 14, 22 and 30℃ and 95% RH. Each sample was exposed individually to synthetic atmospheres with careful control of SO_2 concentration (107 and 500 ppb), relative humidity and flow conditions. The initial reaction between SO_2 and zinc was studied in a time-resolved manner. Two-week exposures were performed to measure the corrosion rate and study the formation of corrosion products. Corrosion products were analysed by X-ray powder diffraction and ion chromatography. The corrosion rate was inversely dependent on temperature, the maximum rate being found at the lowest temperature. SO_2 deposition showed a similar trend with the highest deposition rate at 4℃. At low temperature a thick film of ZnSO_4(aq) formed on the metal surface, whereas zinc hydroxysulphate (ZnSO_4 · 3Zn(OH)_2 · 4H_2O(s)) was the main corrosion product at 22 and 30℃. The inverse temperature-dependence of the corrosion rate of zinc is proposed to be connected to the formation of sparingly soluble zinc hydroxy sulphate which slows down the deposition of SO_2 on the surface.
机译：在4、14、22、30℃和相对湿度95％的条件下研究了SO_2对锌的大气腐蚀。将每个样品单独暴露于合成气氛中，并仔细控制SO_2浓度（107和500 ppb），相对湿度和流动条件。以时间分辨的方式研究了SO_2与锌之间的初始反应。进行两周的暴露以测量腐蚀速率并研究腐蚀产物的形成。通过X射线粉末衍射和离子色谱法分析腐蚀产物。腐蚀速率与温度成反比，最大腐蚀速率在最低温度下发现。 SO_2的沉积趋势相似，在4℃时沉积速率最高。在低温下，在金属表面形成了一层厚厚的ZnSO_4（aq）膜，而在22和30℃时，主要的腐蚀产物是羟基硫酸锌（ZnSO_4·3Zn（OH）_2·4H_2O（s））。锌的腐蚀速率与温度的反相关性被认为与难溶的羟基硫酸锌的形成有关，后者减缓了SO_2在表面上的沉积。

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