Effect of Surface Roughness on Crystal Size of Manganese Phosphate Coating of Carbon Steel
In this study, the correlation between surface roughness of carbon steel and crystal size of manganese phosphate coatings has been investigated. The microstructure and surface morphology of the coatings were analyzed by SEM, XRD. The surface roughness test was carried out in order to
calculate Ra
value by atomic force microscopy (AFM). Also, the tribology property of manganese phosphate coating was tested by ball-on disk. XRD showed that (Mn,Fe)5H2(PO4)4·4H2O in manganese phosphate coating
layer was formed by the chemical reaction between manganese phosphate and elements in carbon steel. Also, (Mn,Fe)5H2(PO4)4 · 4H2O was observed to be formed in all manganese phosphate conversion coating. With regard to the effects
of surface roughness on manganese phosphate coatings, it can be seen that there is an increase of the crystal size on manganese phosphate coating as the surface roughness of carbon steel decreased. The increase of crystal size by the surface roughness had effect on the tribology property and
electrochemical property. It was approved that friction coefficient of manganese phosphate coating is remarkably improved as the surface roughness of carbon steel become rough.
Keywords: Manganese Carbonate Phonon; Manganese Phosphate; Surface Roughness; Tribology
Document Type: Research Article
Affiliations: 1: Metal & Machinery Center, Korea Conformity Laboratories (KCL), 199 Gasan Digital 1-ro, Geumcheon-gu, Seoul, 08503, Republic of Korea 2: Samhwa P&T Co., Ltd., 18 Ojeongongeop-gil, Uiwang-si, Gyeonggi-do, 16071, Republic of Korea 3: Department of Metallurgical Engineering, College of Engineering, INHA University, Incheon, 22212, Republic of Korea
Publication date: 01 July 2020
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