Method for evaluating filamentous corrosion resistance of aluminum wheel finish turning surface

Abstract

The invention discloses a method for evaluating filamentous corrosion resistance of an aluminum wheel finish turning surface, and belongs to the technical field of automobile surface protection. The method comprises the following steps: 1) carrying out a stone impact test; 2) performing a neutral salt spray test; 3) measuring the expanding width K1 of the finish turning surface of the aluminum wheel for the first time; 4) performing a copper accelerated acetate mist test; 5) measuring the expanding width K2 of the finish turning surface of the aluminum wheel for the second time. Through the evaluation method designed by the invention and in combination with after-sales exploration, when the thickness of a paint film on the edge of the finish turning surface of the aluminum wheel is more than or equal to 30 microns, the expansion widths K1 and K2 of the finish turning surface of the aluminum wheel obtained by the evaluation method designed by the invention are less than or equal to 1.5mm, and the filiform corrosion phenomenon of the finish turning surface of the aluminum wheel is not found after sales; therefore, the evaluation method designed by the invention has good guidance suggestions for the production and after-sales service of the aluminum wheel.

Description

technical field [0001] The invention relates to a method for evaluating paint performance on the surface of an automobile wheel, belonging to the technical field of automobile surface protection, in particular to a method for evaluating the filiform corrosion resistance performance of a fine aluminum wheel surface. Background technique [0002] Due to the demand for lightweight vehicles, almost all passenger car wheels in China currently use aluminum alloy wheels. Due to aesthetic and performance requirements, some aluminum wheel hub spoke surfaces adopt the "fine car + varnish coating" technology, and other areas use full Paint coating. However, the fine surface of aluminum wheels is prone to filiform corrosion quality problems after sales. In recent years, this problem has become one of the main problems of after-sales returns and customer complaints. [0003] The domestic OEMs currently adopt the following two methods for evaluating the corrosion resistance of paint coat...

AI Technical Summary

Problems solved by technology

These operation methods can quickly evaluate the paint coating performance of aluminum wheels, but there are many defects. For example, the experiments are all carried out on paint samples, which is an evaluation of the paint process itself, which is quite different from the actual working conditions of after-sale wheels. Moreover, the paint sample itself does not have coating unevenness caused by part modeling problems, which makes the test results obtained by the above evaluation method not typical representative, so it is impossible to effectively evaluate the wire resistance of the edge coating of the finished car aluminum wheel under actual working conditions Corrosion performance

[0004] At present, the corrosion test of the actual working condition of the vehicle road is considered to be the most effective evaluation method, but this method has a long period, high cost, and lagging nodes, which cannot effectively evaluate the quality risk in the development stage of parts, and cannot provide information for actual production. constructive guidance

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