Method for evaluating filamentous corrosion resistance of aluminum wheel finish turning surface
A technology for filiform corrosion and aluminum wheels, which is applied in the field of evaluating the filiform corrosion resistance of aluminum wheels, can solve problems such as node lag, uneven coating, and the inability to effectively evaluate quality risks in the development stage of parts, so as to reduce The effect of the evaluation cycle
Pending Publication Date: 2021-01-29
DONGFENG PEUGEOT CITROEN AUTOMOBILE
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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 imp
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Embodiment
[0073] In order to further illustrate that the evaluation method designed by the present invention does have guiding significance for the actual production of aluminum wheels, this embodiment explores the fine surface of aluminum wheels with different edge paint film thicknesses to simulate the above-mentioned stone impact and salt spray tests, and the corrosion conditions obtained are shown in the table 1 shown;
[0074] Table 1 Corrosion of aluminum wheel finish surface with different paint film thickness
[0075]
[0076]It can be seen from the above examples that the evaluation method designed by the present invention is closely related to the actual production of aluminum wheels, and the accuracy of the final evaluation result is relatively good.
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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...
Claims
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CPCG01N17/00
Inventor 曹鑫谭何灵余梅玲许梦绮周宗明
Owner DONGFENG PEUGEOT CITROEN AUTOMOBILE
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