Why is there yellow rust on the surface of the spring after rust prevention? How to clean and prevent rust on springs?
April 28, 2022
Recently, some spring manufacturers feedback: After the spring has been industrially cleaned, there is still a grease-like layer on the surface that cannot be washed off. There is no way to clean it with hot alkaline water and pickling. After wiping with paper, black oil stains will appear. The surface is dirty and the cleanliness at the time of delivery is not up to standard.
The process before the spring is rust-proof: the raw material is rolled by the coiling machine and then tempered at 400C. Anti-rust treatment of spring surface: dehydrated anti-rust oil Spring cleaning and rust prevention 1. Analysis of the possible causes of the macular problem on the spring surface ① Before coating the surface of the spring with anti-rust oil, it is necessary to ensure that there is no rust problem on the surface (any rust and rust will affect the anti-rust.
② After industrial cleaning of the spring surface, whether it has been rinsed (if there is no rinsing, there will be industrial cleaning agent residues on the surface), and the cleanliness and dryness of the spring surface should be guaranteed after cleaning. If there is residual cleaning agent or residual moisture after the spring is cleaned, there will be rust inside after applying anti-rust oil.
③ After the coiled spring is tempered, the surface temperature of the spring is too high. If it is not cleaned before tempering, it will cause the dirt residue and anti-rust oil on the surface of the spring to solidify on the surface, which is difficult to clean. 2. Suggestions for Solving Macular Problems on Spring Surface ① After cleaning the spring, if the dryness of the surface cannot be guaranteed, you can apply a replacement type anti-rust oil to replace the water on the surface, which may solve the problem.
② Clean the spring before treatment, and the surface is free of oil. After tempering, check the state to know whether it is the oil problem or the heat treatment problem.
③ It is recommended to replace the anti-rust oil with a water-based anti-rust agent to reduce the risk of oil pollution. (The corresponding process also needs to be adapted according to the anti-rust products used) 3. Precautions for spring cleaning and rust prevention ① The surface of the spring should be free of oil stains, hand sweat, dust impurities, cutting chips and heat-treated salt traces and other adhering substances;
② The surface should be free of rust and corrosion before and after cleaning and rust prevention;
③ After the spring is cleaned, it should be fully dry and free of moisture. Anti-rust later.
④ For the anti-rust of the spring, the anti-rust bag or the anti-rust desiccant can be selected on the packaging for terminal anti-rust, so as to ensure that the anti-rust period of the spring meets the customer's requirements.
