锌基无结晶镀层力学性能与破损腐蚀机理研究

锌基无结晶镀层力学性能与破损腐蚀机理研究
　　None-crystallize coating technology is a new way to formation of the coating.It doesn’t pollute the environment. This technology has wide market prospect.Mechanical plating is a typical example of none-crystallize coating technology.In recent years Mechanical plating has obtationed widely society accreditation and its process and production conditions have been continuously improved.Users pay more attention to all aspects of the plating’s performance. So it is necessary to deeply analysis various performance of the plating, enabling users to have a more deeply understanding of Mechanical plating.The paper is mainly study of Mechanical Properties, anti- impact properties and the corrosion mechanism after the plating was damaged.The coating’s hardness is researched by using Micro-hardness Test and surface Rockwell hardness Test. The feasibility of practical application of the two methods was discussed, and then the effects on the hardness of the coating of the coating’s thickness, composition and other factors were also investigated.The results showed that the coating’s rare earth magnets Micro-hardness was impacted by the sample and the detection of regional and The results can not accurately reflect the coating’s hardness. Using surface Rockwell hardness Test could eliminated of these affectings.The results of Rockwell Superficial Hardness Test could reflected the coating’s hardness. The coating’s hardness was mainly affected by its density. The more dense coating was, the higher the hardness was.Used the most popular mechanical plating adhesive strength detection methods (frame, bending) and self-designed method for testing, and then factors which impacted coating adhesive strength was investigated. The results showed that: the traditional methods of testing the coating adhesive strength can only did a simple qualitative analysis, but the stretching method could be a combination of quantitative measurement of coating strength.
　　When the combination of the coating and substrate the coating was broken, it was binding failure.The result showed that the combination of the coating and substrate was less than the combination of zinc powder particles cohesion, the principal factors which influenced Coating adhesive strength were Mechanical plating process conditions, the coating s composition and thickness. The coating’s adhesive strength of adding less Sn salt plating process is strength than "flash copper" plating process.With the combination of coating’s thickness increased its strength was gradually declined.The painting Film impact tester was used for analysis the failure form of http://www.chinamagnets.biz/ Mechanical plating in the transport machinery and impact loading. A mathematical model was created and then compared the model with the experimental results. It showed that the Mechanical plating’s anti-impact capacity is mainly affected by the deformation of zinc powder and deformation ability of the particles. The coating’s compositions had a little effect on this ability.The paper also studied the corrosion mechanism of damaged coating. The coating’s uneven electrochemical formed many of the activity - blunt -corrosion batteries and zinc particles was the sacrificial anode corrosion. The Galvanic corrosion was formed between the substrate and the coating when the coating was damaged. The coating could be effective protected against corrosion in the effective protection area of the coating. The addition of appropriate RE elements could be purification internal coating. The surfactant point is reduced and the corrosion resistance of the coating was improved. The corrosion resistance of the coating is enhanced when appropriate Aluminum was joined to the coating. But a cross -cutting excessive porosity would be formed when too many Aluminum was joined, and the coating’s corrosion resistance would be reduced.