The Fabrication And Anticorrosion Property Analysis Of Laser Cladding Copper Alloy Coating

Copper Alloy has the dual performance of corrosion resistance and anti-fouling,laser cladding technology plays an important role in the preparation of wear-resistant and corrosion-resistant coatings,in order to improve the resistance of metal materials in marine environment to seawater corrosion and anti-sea biological fouling performance,In this paper,the cladding layer of Cu-20Cr-Mo and Cu-8Cr-Mo two alloy components was prepared by laser cladding technology on Q235 steel and 316 stainless steel matrix materials respectively.The phase composition,microstructure and corrosion characteristics of the cladding layer were analyzed by SEM and EDS,the microscopic hardness changes of the cross section of the cladding layer were tested by the microscopic Vickers hardness meter,and the corrosion resistance of the cladding layer was evaluated by electrochemical experiments.In addition,the seepage rate of copper ions in simulated seawater was determined by the contrast of Cu-8Cr-Mo cladding layer and cast copper,and the properties of anti-Sea biological fouling were analyzed.In the Cu-20Cr-Mo cladding layer,there is a serious liquid phase separation,the structure is not uniform,the cladding layer is composed of Cu-rich matrix facies and a large number of Ni,Cr,Mo Circular precipitate,and the matrix material is poorly combined,crack holes are found in it.The microstructure of the Cu-8Cr-Mo cladding layer is uniform,which is a single-phase copper-based solid solution of solid soluble Ni,Cr and Mo,mainly a branch crystal,and a good metallurgical combination with the matrix material.The hardness of the Cu-8Cr-Mo cladding layer is divided into three distinct areas:cladding area,bonding area and matrix material.Under the influence of the matrix material,the Cr content increases,the hardness of the cladding layer becomes larger and the wear resistance is enhanced,and at the same time,there is a large internal stress in the cladding layer,and microcracks appear at the interface of the cladding layer/matrix material.Electrochemical corrosion experiments show that the cladding samples are passivation materials,and the corrosion resistance of the Cu-8Cr-Mo cladding prepared on 31 6 stainless steel is better.The electrochemical corrosion experiments show that the cladding samples are passivation material system,and the corrosion resistance of the Cu-8Cr-Mo cladding layer prepared on 316 stainless steel is better.The experimental results show that the Cu-8Cr-Mo cladding layer and the active Q235 steel are more prone to coupling corrosion,which is consistent with the research results of the corrosion characteristics of the boundary area.the corrosion resistance of the cladding layer boundary area is poor,the contact corrosion and gap corrosion occurred at the interface of the cladding/Q235 steel matrix material,and the corrosion of the matrix material is accelerated.Causes the substrate material to detach from the cladding layer.Copper ion exudation Experiments show that the precipitated hard particles can promote the continuous dissolution and release of copper ions in the Cu-8Cr-Mo cladding layer and inhibit the growth of sea organisms.In summary,the corrosion resistance anti-fouling Cu-8Cr-Mo cladding layer with good performance was prepared on 316 stainless steel by laser cladding technology.