ATMOSPHERIC CORROSION BEHAVIOR OF HOT-DIP GALVANIZED AND CONTINUOUS GALVANIZED STEEL

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-09-24 DOI:10.36547/ams.28.3.1526

G. Sığırcık, Ömer Yıldırım, T. Tüken

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Abstract

Five years of outdoor atmospheric corrosion tests of hot dip galvanized steel samples were performed, for products of continuous galvanizing and after fabrication batch galvanizing processes. For the purpose of comparison between corrosion performances of these two different galvanizing process products, an industrial coastal area (Gemlik-Bursa/TURKEY) was chosen for outdoor testing, which fits into C4 type corrosive atmosphere definition, according to ISO 9223. Samples were studied in laboratory with accelerated salt spray exposure test and electrochemical methods. Corrosion products formed on exposed samples and cross section of coatings are analyzed by SEM. Lead is observed to change the corrosion characteristics of the coatings with change in constituents of environments. In saline electrolytes, alloying of lead is found to accelerate corrosion rate. This metal deposits as cluster on top layer of the galvanized coatings and acts as strong cathodes with respect to the zinc and accelerates the corrosion rate. It was determined that differences in dip and continuous galvanization processes cause dramatic differences in the elemental composition, morphology and regional hardness values of coatings. In the comparison of corrosion resistance, lower performance of the dip galvanized coating, although it is much thicker, has been shown due to the differences mentioned above.

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热镀锌和连续镀锌钢的大气腐蚀行为

对连续镀锌和批量镀锌产品进行了5年的室外大气腐蚀试验。为了比较这两种不同镀锌工艺产品的腐蚀性能，选择了一个工业沿海地区(gemlikk - bursa /TURKEY)进行室外测试，该地区符合ISO 9223的C4型腐蚀性大气定义。采用加速盐雾暴露试验和电化学方法对样品进行了室内研究。利用扫描电镜分析了裸露试样和涂层截面上形成的腐蚀产物。观察到铅会随着环境成分的变化而改变镀层的腐蚀特性。在含盐电解质中，发现铅的合金化会加速腐蚀速率。这种金属以簇状沉积在镀锌涂层的顶层，作为锌的强阴极，加速了腐蚀速度。结果表明，浸镀锌和连续镀锌工艺的不同会导致镀层元素组成、形貌和区域硬度值的显著差异。在耐腐蚀性能的比较中，由于上述差异，浸镀锌涂层虽然厚得多，但性能较低。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.