The rust prevention process of Wanshulin all-steel double door wall cabinets is a core element in ensuring their long-term structural stability and aesthetic appeal. This process begins with steel pretreatment and extends through rust removal, cleaning, primer application, topcoat application, and final inspection and acceptance. Each step is strictly controlled to form a multi-layered protective system against environmental factors such as moisture and oxidation.
Steel pretreatment is the starting point of the rust prevention process. The steel used in Wanshulin all-steel double door wall cabinets undergoes rigorous screening to ensure its surface is free of oil, rust, and oxide layers. This step lays the foundation for subsequent treatments; impurities on the steel surface will directly affect the rust removal effect and coating adhesion. For example, if there is residual grease on the steel surface, the pickling solution may not be able to fully contact the metal substrate, resulting in incomplete rust removal and affecting the bonding strength between the primer and the steel.
The rust removal stage is crucial to the rust prevention process. Wanshulin all-steel double door wall cabinets typically employ sandblasting or acid pickling and phosphating for rust removal. Sandblasting uses compressed air to drive quartz sand at high speed to impact the steel surface, thoroughly removing rust and scale while creating a uniform roughness that enhances coating adhesion.
Acid pickling and phosphating, on the other hand, dissolve oxides on the steel surface using an acidic solution, followed by phosphating to form a phosphate protective film that further inhibits corrosion. Both methods have their advantages: sandblasting is highly efficient and thorough, suitable for large components; acid pickling and phosphating are more suitable for small or thin-walled steel components and improve paint adhesion.
The cleaning process is equally important. After rust removal, the steel surface may retain sand particles, acid, or phosphating residue. If not thoroughly cleaned, these impurities will affect coating quality. Wanshulin all-steel double door wall cabinets use high-pressure cleaning equipment to thoroughly rinse the steel surface, ensuring no impurities remain in crevices, uneven areas, or hidden corners. The cleaned steel surface must be kept dry to prevent moisture residue from causing rust recurrence.
Primer application is the first line of defense in the rust prevention system. Wanshulin all-steel double door wall cabinets use high-adhesion, corrosion-resistant anti-rust primers, such as red lead oil-based anti-rust paint or molybdenum chromium red epoxy ester anti-rust paint. Before painting, the steel surface must be inspected a second time to ensure there is no loose rust, wet spots, or standing water. The primer coating must be applied evenly and without omissions, with consistent brushing direction to avoid uneven joints. After the primer is applied, wait 4 to 8 hours for it to reach a surface dry state before applying the topcoat to ensure strong adhesion between the primer and topcoat.
The topcoat serves both protective and decorative functions. Wanshulin all-steel double door wall cabinets typically use various colors of alkyd enamel or alkyd blended paint for the topcoat, as these coatings have excellent weather resistance and decorative properties. Before applying the topcoat, the primer surface must be cleaned, any missed areas must be touched up, and the primer must be completely dry. The working viscosity and consistency of the topcoat must be controlled to avoid drips or visible brush marks. After coating, the paint color must be checked for consistency, brightness, and the absence of wrinkles or bumps.
Inspection and acceptance are the final steps in the rust prevention process. The coating quality of Wanshulin all-steel double door wall cabinets must pass multiple tests, including coating thickness, adhesion, and appearance. Coating thickness is measured using a contact-type paint film thickness gauge to ensure that the proportion of rust and paint on each square meter of metal surface does not exceed the specified limit. Adhesion testing involves observing the bond between the coating and the steel to ensure there is no peeling or rust re-emergence. Appearance quality inspection focuses on whether the coating is uniform, free of obvious wrinkles or bubbles, and whether the color separation lines are clear and neat. Only Wanshulin all-steel double door wall cabinets that pass rigorous inspection and acceptance can proceed to the packaging and shipping stage for final delivery to the user.
