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首页> 外文期刊>ISIJ international >Automotive Corrosion and Accelerated Corrosion Tests for Zinc Coated Steels
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Automotive Corrosion and Accelerated Corrosion Tests for Zinc Coated Steels

机译：镀锌钢的汽车腐蚀和加速腐蚀试验

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Numerous studies on zinc and zinc alloy coated steel sheets have appeared since corrosion problems were widely recognized in the automotive industry in the 1970s. In general, accelerated corrosion tests including the Salt Spray Test and Cyclic Corrosion Tests have been applied to evaluate the corrosion resistance of coated steels in the laboratory in order to shorten the product development period. However, the reproducibility of corrosion in actual use conditions by corrosion tests is always a controversial issue. In this paper, author’s previous studies regarding corrosion of coated steel sheets in automobiles and corrosion tests are reviewed. The perforation corrosion behaviors of coated steels at lapped parts in snowy and tropical regions were clarified on the basis of an analysis of corroded vehicles. Several types of accelerated corrosion tests used in the automotive industry were conducted for comparison with the corrosion observed in the actual vehicles. The Perforation Corrosion Index (PCI), which is the corrosion rate ratio of steel and zinc coating, was introduced as an index for comparing the correlation of corrosion behaviors. Coating weight is the major factor determining the perforation corrosion resistance of existing coated materials in automobile use environments. Corrosion tests that have a PCI value close to that in the use environment can simulate similar corrosion tendencies. The influence of the specimen configuration is also a key factor for adequate evaluation of corrosion resistance. Specimens without an intentional large clearance and bare metal surface in the lapped portion are recommended for perforation corrosion tests.
机译：自从1970年代在汽车工业中广泛认识到腐蚀问题以来，已经出现了许多对锌和锌合金涂层钢板的研究。通常，在实验室中采用了包括盐雾试验和循环腐蚀试验在内的加速腐蚀试验来评估涂层钢的耐腐蚀性，以缩短产品开发周期。但是，在实际使用条件下，通过腐蚀试验对腐蚀的再现性始终是一个有争议的问题。在本文中，作者回顾了以前有关汽车中涂层钢板腐蚀和腐蚀测试的研究。在对腐蚀车辆进行分析的基础上，弄清了涂层钢在下雪和热带地区搭接部位的穿孔腐蚀行为。为了与实际车辆中的腐蚀进行比较，进行了几种在汽车工业中使用的加速腐蚀试验。引入了钢和锌涂层的腐蚀速率比即穿孔腐蚀指数（PCI），作为比较腐蚀行为相关性的指标。涂层重量是决定现有涂层材料在汽车使用环境中抗穿孔腐蚀性能的主要因素。 PCI值接近使用环境的PCI腐蚀测试可以模拟相似的腐蚀趋势。样品配置的影响也是充分评估耐腐蚀性的关键因素。对于穿孔腐蚀试验，建议不要在试样的间隙部分留有较大间隙和裸露的金属表面。

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