EXPLORING CORROSION RESISTANCE AND MICROSTRUCTURE OF MANGANESE PHOSPHATE CONVERSION COATING ON 65Mn SPRING STEEL

Peng-fei Zhang; Ke-yao Li; Gang Ji; Qi Liu; Long-fei Xie; Lin-Feng Wei; De-cheng Wang

doi:10.17222/mit.2024.1198

Peng-fei Zhang University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing, 100083, P.R. China
Ke-yao Li China Xi’an Rare Metal Materials Institute Co., Ltd., 96 Weiyang Road, Xi’an, 710016, P.R. China
Gang Ji China Xi’an Rare Metal Materials Institute Co., Ltd., 96 Weiyang Road, Xi’an, 710016, P.R. China
Qi Liu China Xi’an Rare Metal Materials Institute Co., Ltd., 96 Weiyang Road, Xi’an, 710016, P.R. China
Long-fei Xie China Xi’an Rare Metal Materials Institute Co., Ltd., 96 Weiyang Road, Xi’an, 710016, P.R. China
Lin-Feng Wei China Xi’an Rare Metal Materials Institute Co., Ltd., 96 Weiyang Road, Xi’an, 710016, P.R. China
De-cheng Wang China Academy of Machinery Science and Technology, 2 Shouti Road, Haidian District, Beijing, 100044, P.R. China

DOI: https://doi.org/10.17222/mit.2024.1198

Keywords: 65Mn spring steel, manganese phosphate, microstructure, corrosion resistance

Abstract

Manganese phosphate conversion coatings were prepared on 65Mn spring steel. The surface morphologies and compositions of the coatings were examined through scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion resistance of the coatings was investigated using a copper sulfate titration experiment, salt spray test and electrochemical corrosion test. The results showed that a uniform and dense coating was obtained when the acid ratio was 10, the phosphating temperature was 85 °C, and the phosphating time was 5 min. There was no obvious rust on the manganese phosphate coating surface after 48 h of salt spray. Ultimately, the growth mechanism and corrosion behavior of the manganese phosphate conversion coating are explained.

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