Open AccessCorrosion Behavior of C4 Coating Produced by Cladding Laser in Sulfuric Acid
Author(s) -
Jiale Ma,
Zongde Liu
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1635/1/012074
Subject(s) - corrosion , materials science , sulfuric acid , coating , metallurgy , cladding (metalworking) , scanning electron microscope , passivation , oxide , cathodic protection , composite material , electrochemistry , layer (electronics) , chemistry , electrode
C4 coating was prepared by high power multilayer laser cladding. Corrosion behavior of the C4 coating and 316 stainless steel in sulfuric acid solution was investigated. The corrosion rate was measured by using the mass loss method. Obvious corrosion morphology and serious exfoliation corrosion of 316 stainless steel are noticed in sulfuric acid solution. While C4 coating after corrosion test shows nearly unchanged surface morphology. The results show that corrosion resistance of C4 coatings is higher than 316 stainless steel. The corrosion morphology was observed by SEM(Scanning Electron Microscope), and the elements distribution of corrosion products was analyzed by EDS(Energy-Dispersive X-ray Spectroscopy).The results show that the S element content increased with the extension of corrosion time, while the Cr content decreased. For the 316 stainless steel, with the extension of corrosion time, the content of C increased. The sulfur-containing corrosion products on the surface are all dissolved in the acid solution. The contents of Cr and Ni decreased, and their passivation ability was weakened. The results indicate that C4 coating exhibits better corrosion resistance in sulfuric acid solution due to the stable formation of dense oxide film on the surface.