Enhanced erosion-corrosion resistance of monolithic ENP coating on ductile cast iron by using electrochemical pretreatment and heat treatment

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2024-10-30 DOI:10.1016/j.surfcoat.2024.131525

Hossein Kheirabadi , Saeed Reza Allahkaram , Arman Zarebidaki

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Abstract

This research aims to enhance the erosion-corrosion durability of monolithic ENP coating used on ductile cast iron. The ENP coating does not usually adhere well to the cast iron surface due to the special characteristics and innertness of the graphite sphere so an electrochemical surface pre-treatment containing a cathodic treatment was implemented to ensure proper adhesion of the coating to the surface. A slurry pot erosion-corrosion test was performed at a linear velocity of 10 m/s for 16 h, and it verified the efficacy of the treatment. Three different heat treatments were carried out on coated samples at 200 °C, 400 °C, and 600 °C. The sample heat-treated at 600 °C exhibited a pseudo-passivation behavior and displayed the best corrosion resistance of 0.1407 μA/cm2. Nonetheless, in erosion-corrosion tests, it was outperformed by other coatings due to the removal of its oxide layer. The heat treatment at 400 °C resulted in the highest hardness of 871 Vickeres and the best erosion-corrosion resistance of 8.8 mpy compared to 11.74 mpy for the as-plated sample and 381.3 mpy for the cast iron substrate.

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利用电化学预处理和热处理增强球墨铸铁整体 ENP 涂层的抗侵蚀和耐腐蚀性能

本研究旨在提高球墨铸铁整体 ENP 涂层的侵蚀-腐蚀耐久性。由于石墨球的特殊性和惰性，ENP 涂层通常不能很好地附着在铸铁表面，因此采用了包含阴极处理的电化学表面预处理方法，以确保涂层与表面的正确附着。在线速度为 10 米/秒的条件下，进行了 16 小时的浆锅侵蚀-腐蚀试验，验证了处理的有效性。对涂层样品进行了三种不同的热处理，温度分别为 200 ℃、400 ℃ 和 600 ℃。在 600 °C 下热处理的样品表现出假钝化行为，耐腐蚀性能最好，为 0.1407 μA/cm2。然而，在侵蚀-腐蚀测试中，由于氧化层的脱落，它的性能要优于其他涂层。在 400 °C 下进行热处理后，硬度最高，达到 871 Vickeres，抗侵蚀腐蚀性能最好，为 8.8 mpy，而无镀层样品为 11.74 mpy，铸铁基底为 381.3 mpy。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.