Medal quality storm risesAt the 2024 Paris Olympics, a global sporting event, each medal carries the sweat and glory of the athletes. However, the recent exposure of the medals quality problems, especially the American skateboarder Niya Houston bronze plating off, rust and black phenomenon, triggere

1. The black spot is mainly the workpiece in the clean and then by the dirty spots attached to the surface, such as: wipe the residue, turnover process of the dust, hanging, furnace plate, heating tube and other collapsed deposits fall on the product, due to the extraction of the furnace fly ash fal

1. The surface of the coating is hazy visually, with a rough feeling, mainly due to the arc ion bombardment, priming or coating with a large number of macro-particles deposited on the product, the result of diffuse reflection on the light.2. the surface of the coating or local color tone dark, looks