Jędrzejczyk Dariusz, Szatkowska Elżbieta
Department of Mechanical Engineering Fundamentals, University of Bielsko-Biala, Willowa 2, 43-309 Bielsko-Biała, Poland.
BOSMAL Automotive Research and Development Institute Ltd., Sarni Stok 93, 43-300 Bielsko-Biala, Poland.
Materials (Basel). 2022 Aug 26;15(17):5887. doi: 10.3390/ma15175887.
The analyzed topic refers to the corrosion resistance and changes in microhardness of the heat-treated (HT) hot-dip zinc coating deposited on bolts. The research aimed to evaluate the influence of the HT on the increase of the coating hardness and changes in anticorrosion properties. Hot-dip zinc coating was deposited in industrial conditions (acc. EN ISO 10684) on chosen bolts (M12x60). The achieved results were assessed based on corrosion resistance tests in neutral salt spray (salt chamber) and microhardness measurements. Tests were conducted in accordance with the adopted fractional plan, generated in the DOE module of the Statistica software. Using the conjugate gradient method optimal parameters of HT were determined. The conducted tests proved that the controlled heat treatment may increase the hardness of the hot-dip zinc coating without a significant deterioration in its basic protective function (corrosion resistance). The observed changes in the hardness and corrosion resistance of the zinc coating are a consequence of changes in its structure.
分析的主题涉及沉积在螺栓上的热处理(HT)热浸锌涂层的耐腐蚀性和显微硬度变化。该研究旨在评估热处理对涂层硬度增加和防腐性能变化的影响。热浸锌涂层在工业条件下(符合EN ISO 10684)沉积在选定的螺栓(M12x60)上。基于中性盐雾(盐雾试验箱)中的耐腐蚀性测试和显微硬度测量对所得结果进行评估。测试按照在Statistica软件的DOE模块中生成的采用的分数计划进行。使用共轭梯度法确定了热处理的最佳参数。进行的测试证明,可控的热处理可以提高热浸锌涂层的硬度,而不会使其基本保护功能(耐腐蚀性)显著恶化。锌涂层硬度和耐腐蚀性的观察到的变化是其结构变化的结果。