HVOF 工艺在 ZnCl2-KCl 高温下制备 Ni20Cr 涂层的电化学研究。

Electrochemical Study of Ni20Cr Coatings Applied by HVOF Process in ZnCl2-KCl at High Temperatures.

机构信息

Universidad Autonoma del Estado de Morelos, CIICAp, Avenida Universidad 1001, 62209 Cuernavaca, MOR, Mexico ; Universidad Nacional Autonoma de Mexico, Instituto de Ciencias Fisicas, Avenida Universidad s/n, 62210 Cuernavaca, MOR, Mexico.

Universidad Autonoma del Estado de Morelos, CIICAp, Avenida Universidad 1001, 62209 Cuernavaca, MOR, Mexico.

出版信息

J Anal Methods Chem. 2014;2014:503618. doi: 10.1155/2014/503618. Epub 2014 Aug 25.

DOI:10.1155/2014/503618

PMID:25210645

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4158463/

Abstract

Corrosion behavior of Ni20Cr coatings deposited by HVOF (high velocity oxygen-fuel) process was evaluated in ZnCl2-KCl (1 : 1 mole ratio) molten salts. Electrochemical techniques employed were potentiodynamic polarization curves, open circuit potential, and linear polarization resistance (LPR) measurements. Experimental conditions included static air and temperatures of 350, 400, and 450°C. 304-type SS was evaluated in the same conditions as the Ni20Cr coatings and it was used as a reference material to assess the coatings corrosion resistance. Coatings were evaluated as-deposited and with a grinded surface finished condition. Results showed that Ni20Cr coatings have a better corrosion performance than 304-type SS. Analysis showed that Ni content of the coatings improved its corrosion resistance, and the low corrosion resistance of 304 stainless steel was attributed to the low stability of Fe and Cr and their oxides in the corrosive media used.

摘要

采用动电位极化曲线、开路电位和线性极化电阻（LPR）测量法评价了通过高速氧燃料（HVOF）工艺沉积的 Ni20Cr 涂层在 ZnCl2-KCl（1:1 摩尔比）熔盐中的腐蚀行为。实验条件包括静态空气和 350、400 和 450°C 的温度。304 型 SS 也在与 Ni20Cr 涂层相同的条件下进行了评估，并用作评估涂层耐腐蚀性的参考材料。评估了涂层的沉积态和研磨表面的完成状态。结果表明，Ni20Cr 涂层的耐腐蚀性能优于 304 型 SS。分析表明，涂层中的 Ni 含量提高了其耐腐蚀性，而 304 不锈钢的低耐腐蚀性归因于在使用的腐蚀性介质中 Fe 和 Cr 及其氧化物的低稳定性。