table of Contents：行业新闻release time：2019-08-14 16:51:15Click rate：
The treatment of the rivet surface is generally divided into the quality of the plating with its corrosion resistance as the main measure, followed by the appearance. Corrosion resistance is to imitate the working environment of the product, set as the test condition, and conduct corrosion test. The quality of electroplated products should be controlled in terms of appearance and the like. The surface of the product is not allowed to be partially uncoated, charred, rough, dull, peeled, crusted and streaked, and no pitting, black plating, loose passivation, shedding and severe passivation marks are allowed.
When the fastener is tightened, hydrogen is transferred to the portion where the stress is concentrated, causing the pressure to increase beyond the strength of the base metal and causing a slight surface crack. Hydrogen activity quickly penetrates into the newly formed fissures. This pressure-fracture-infiltration cycle continues until the fastener breaks. Usually occurs within a few hours after the initial stress application, the deposition of the coating on the surface of the fastener is different using different deposition methods. In order to eliminate the threat of hydrogen embrittlement, the fasteners are heated and baked as quickly as possible after plating to allow hydrogen to ooze out of the coating. Baking is usually carried out at 375-4000 F (176-190 ° C) for 3-24 hours.