A brief analysis of the three stages that should be strictly followed in the phosphating treatment of the hardware parts of heavy-duty casters

1. Pre-treatment of caster hardware parts: Pre-treatment of caster hardware parts is the basis for carrying out the electroplating process of caster hardware parts and is also the key to ensuring product quality. If the plated substrate is not treated to the required requirements before the electroplating process of caster hardware parts, even if there are excellent caster hardware parts electroplating process solution, appropriate caster hardware parts electroplating process parameters, and good facilities for controlling caster hardware parts electroplating process parameters and skilled personnel, it is impossible to obtain a caster hardware parts electroplating process layer that meets product quality requirements. Before the electroplating process of caster hardware parts, it is necessary not only to remove the vegetable oil on the substrate alloy and foreign matter that affects the adhesion and other quality requirements of the coating, but also to remove its surface oxides, so that its surface has the required cleanliness and a certain specific activity to ensure that the coating and the substrate are firmly integrated. Sometimes, according to the appearance of the required caster hardware parts electroplating process layer, some other special caster hardware parts electroplating process pre-treatment is required.

2. Management of electroplating process of caster hardware: The application standard and service life of phosphating metal materials or parts of caster hardware are closely related to the thickness of electroplating process layer of caster hardware. The stricter the application standard and the longer the service life, the thicker the required phosphating layer of caster hardware should be. Different products should be determined according to the actual environment (temperature, humidity, precipitation, atmospheric composition, etc.) to determine the estimated service life of the caster hardware electroplating process layer thickness. Blindly following the trend of thickening will lead to various losses. However, if the thickness is not enough, it will not meet the expected service life requirements. Different manufacturers, according to their own equipment conditions, must first compile a relatively complete and effective production process, determine the main parameters of the electroplating process of the caster hardware, control the concentration of the electroplating process liquid of the caster hardware, and carry out standardized operations.

3. Heavy-duty caster post-plating treatment process: In order to improve the safety and protection properties, decorative art and other special purposes of electroplating, the caster hardware part of the electroplating process (passivation treatment, hot melting, sealing and dehydrogenation, etc.) is implemented. After hot-dip galvanizing, chromium trioxide passivation treatment or other conversion treatment is generally carried out to produce a corresponding type of conversion film. It is one of the important processes to ensure the quality of post-plating. After passivation treatment, embrittlement treatment should also be carried out.