How to test the adhesion strength of plating of the silver layer

Silver plating process, the broad range of applications. Not long ago, someone actually put his car coated with a layer of silver, the effect is extraordinary. Silver experts often encounter some problems. For example, the surface of the silver layer plating adhesion strength of the how judgment below to see Shanghai silver plating plant experts is how to test.
Silver plating adhesion test:
1 bend test will be bent or folded sheet plating, coating shall not come off. Linear plating along the winding Molybdenum tube test, observe whether there is loss from the skin.
2 crossed cut test with 30 ° sharp hard steel knife coating surface zoned zoned 2mm apart parallel lines cut through metal coating reaches the base metal. Crossed between the base metal coating shall not escape, or cross-zoned into lmm small box, not from the skin, shedding.
3 trial rasp rasp edges from the base about a 45 ° angle, file moving coating surface, the coating should not lift or fall off.
4 Thermal shock test The large specimens in a furnace heated to 300 ℃, heat lh, and then quenched in water, the coating may not blistering, peeling separation.
If silver device can withstand the test of the above three methods, indicating that the device is electroplated silver layer adhesion is quite reliable. Of course, there are other testing methods, mainly above four.If the surface of the substrate there are a lot of oil, corrosion products and other contaminants, the plating layer is not directly with the substrate surface combined, resulting in the coating gradually from the skin, loss, etc., which is the coating and the substrate surface binding poor sake . In contrast, if prior to plating, electroplating production line the surface of the base material to obtain a good cleaning, the plating layer will be in direct contact to the substrate surface of the material, and with a solid combination. Of course, the metal ion in the metal electrodeposition but also with many other factors, the surface state of the substrate is not the only factor affecting the binding force, but it is the most important factor affecting binding.