How to do a good job in the follow-up maintenance of tungsten carbide spraying?

How to do a good job in the follow-up maintenance of tungsten carbide spraying?

Tungsten carbide spraying is a process that improves the surface properties of materials. Proper maintenance can extend the service life of coatings and ensure their stable performance. The following are the relevant maintenance points:

Daily cleaning and inspection

Regular cleaning: Clean the tungsten carbide sprayed parts regularly according to the usage environment. For components used in general industrial environments, they can be cleaned once a week or once a month; In harsh environments such as dusty, humid, or chemically corrosive substances, the cleaning cycle should be shortened accordingly, and may need to be carried out once a day or several days. When cleaning, use a mild cleaner and a soft cloth or brush to gently wipe the coating surface to remove dust, oil stains, and other impurities. Avoid using cleaning agents containing abrasives or strong corrosives to prevent damage to the coating.

Appearance inspection: During the cleaning process, carefully inspect the coating surface for defects such as wear, scratches, peeling, cracks, etc. For minor injuries, it is necessary to promptly record and track their development; If large areas of peeling or severe cracks are found, the relevant components should be immediately stopped from use and repaired or replaced. At the same time, check whether there is any looseness or separation at the joint between the coating and the substrate.

Avoid mechanical damage

Operating procedures: When using tungsten carbide sprayed parts, strictly follow the operating procedures to avoid collision or friction between the parts and hard objects. For example, during transportation or installation, use appropriate tools and protective measures to prevent the coating surface from being scratched. During the operation of the equipment, ensure that no foreign objects enter the work area to avoid damage to the coating.

Protective measures: Add protective devices to tungsten carbide sprayed parts according to the actual situation. Install wear-resistant lining plates or protective covers in areas prone to wear to reduce direct impact and wear of the coating from external factors. For coatings on moving parts, the mechanical stress borne by the coating can be reduced by adjusting the operating parameters of the equipment, such as speed, pressure, etc.

Prevent chemical corrosion

Environmental control: Try to place tungsten carbide sprayed parts in a dry, clean, and chemical free environment. If it is impossible to avoid contact with chemical substances, corresponding protective measures should be taken according to the properties of the chemical substances. For example, in environments with acidic and alkaline corrosion risks, additional anti-corrosion treatments can be applied to coatings, such as coating with anti-corrosion paint or using corrosion-resistant protective films.

Timely treatment of corrosion: Once chemical corrosion signs such as discoloration, rust, etc. are found on the surface of the coating, measures should be taken in a timely manner for treatment. Use appropriate methods to remove corrosion products, and then repair or re spray the coating according to the degree of corrosion.

Regular performance testing

Hardness testing: Regularly test the hardness of tungsten carbide spray coatings using professional equipment such as hardness testers. By comparing the hardness values at different stages, the wear and performance changes of the coating can be determined. If the hardness significantly decreases, it may indicate that the coating has suffered significant wear and requires further inspection and evaluation.

Combined strength testing: Use appropriate methods to test the bonding strength between the coating and the substrate, such as tensile testing, scratch testing, etc. The change in bonding strength can reflect the adhesion of the coating. If the bonding strength decreases, there may be a risk of coating peeling, and timely measures should be taken for repair.

Repair and re spraying

Minor damage repair: For minor wear, scratches, and other damages on the coating surface, local repair methods can be used. First, clean and polish the damaged area, then repair it with the same or similar material as the original coating, and perform appropriate treatment to ensure that the repaired area has the same performance as the original coating.

Large area damage treatment: When the coating experiences extensive peeling, severe wear, or significant performance degradation, re spraying may be necessary. Before spraying again, the original coating should be removed and the surface of the substrate should be treated to ensure good adhesion between the new coating and the substrate. The re spraying process should be strictly carried out in accordance with the process requirements to ensure the quality of the new coating.