Visual Inspection Of PVD Coating

- Jan 16, 2019-

Visual inspection of PVD coating

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PVD coating appearance affects the sales of coating workpieces, bright, complete, beautiful coating appearance gives a good visual impression. The appearance defects in the functional area not only affect the appearance of the coating, but also affect the service life of the coating. The surface defects of the coating are mainly peeling and color difference.


1, peeling

 this is determined by the characteristics of the coating process. During the last coating process, the old coating deposited on the furnace wall and fixture will continuously crack and some fragments will be deposited on the workpiece. The new coating covers it rather than binding to the substrate. In this way, during cooling or subsequent process, the old coating will come off with the new coating. The severity of coating shedding depends on the location and size of the shedding site. Peeling of the coating can be examined with a microscopic magnifying glass. Severe visible typical very visible peeling of coating.


 2.the color difference

Color difference refers to the same kind of coating color difference, there are two main cases: one is the same furnace in different positions of the workpiece coating color difference, another is the same as different furnace coating color difference.The color difference is related to the substrate material, the distribution of reaction gas in the furnace, the weight of the target material and the different vacuum degree.Generally, a slight color difference does not affect the performance of the coating.Composition analysis instrument can be used to analyze the difference between different colors of coating composition and to judge the severity of the influence of color difference on coating performance.In the actual production is not a big color difference will not affect the performance of the product, so the attention is not big.If the color difference is very obvious, the naked eye can clearly see, then it is necessary to pay attention to, find the reason.


In the inspection of color stainless steel screens and other products, to pay special attention to the above two kinds of appearance defects.