Galvanic corrosion evaluation method for dissimilar metal plate mechanical connection structure in automobile

Abstract

The invention provides a galvanic corrosion evaluation method for a dissimilar metal plate mechanical connection structure in an automobile, which comprises the following steps of: (1) manufacturing aconnection test part consisting of an anode plate with a hole, a bolt and a nut according to two plate materials of the automobile dissimilar metal plate mechanical connection structure to be evaluated; (2) carrying out an artificial accelerated salt spray test on the connection test part, removing a corrosion product, and measuring the corrosion loss weight and the maximum corrosion depth of thecontact surface area of the surface of the anode plate and the bolt; calculating the maximum corrosion depth ratio and the equivalent uniform corrosion depth of the contact area of the surface of theanode plate and the bolt in the connection test part; and (3) evaluating galvanic corrosion of the dissimilar metal plate mechanical connection structure in the automobile through the maximum corrosion depth ratio and the equivalent uniform corrosion depth, and distinguishing risk levels. The method can well reflect the actual corrosion condition of the contact surface area between the dissimilarmetals, and is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of corrosion protection, and relates to a method for evaluating galvanic corrosion of a mechanical connection structure of dissimilar metal plates in an automobile. Background technique [0002] Lightweight is an important measure for new energy vehicles to save energy, reduce consumption, and improve battery life. In order to achieve the purpose of lightweighting new energy vehicles, dissimilar metals are used to connect parts (two common connection methods see figure 1 , figure 2 ) are increasingly used in new energy vehicles, which can not only reduce the weight of components, but also give full play to the performance advantages of single metals. However, the problems of galvanic corrosion and cost increase at the interface of dissimilar metals cannot be ignored. Therefore, the development of a reliable and rapid evaluation method for the connection structure of dissimilar metals in new energy vehicle...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for evaluating the galvanic corrosion of the mechanical connection structure of dissimilar metal sheets in automobiles, so as to solve the problem that the existing technology cannot conveniently and comprehensively reflect the actual corrosion situation of the material contact area of ​​the mechanical connection structure of dissimilar metal sheets

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