Why is there yellow spot on the surface of the spring after rust prevention?

November 01, 2023

Why is there yellow spot on the surface of the spring after rust prevention?

Why do springs rust?

As a metal product, the spring will rust when placed in a humid environment for a long time. Spring rust will not only make its appearance ugly, but also affect its service life and performance. Therefore, we need to de-rust the spring.

After industrial cleaning of the spring, there is still a layer of similar grease on the surface that cannot be washed off. With hot alkali water, pickling can not be cleaned, there will be black oil stains after paper wiping, the surface dirty lead to delivery cleanliness is not up to standard.

Mechanical cleaner

This is a common way to remove rust from springs. Mechanical cleaning method requires the use of some tools, such as sandpaper, wire brush, grinding and so on. The specific steps are as follows:

1. Wipe the surface of the spring with sandpaper or wire brush to remove the rust and oxidation layer on the surface.

2. Check whether there is still stubborn rust on the spring, if there is, you can use the grinding head to remove.

3. Apply a certain amount of oil or Anti-rust Oil to prevent rust.

Chemical cleaning

Chemical cleaning method is a common and effective method to remove the rust of the spring, which can remove the iron oxide material on the surface of the spring and restore its surface. The specific steps are as follows:

1. Put the spring into dilute acid or dilute alkali solution, so that the oxidation layer on the surface of the spring is removed by chemical reaction.

2. After taking out the spring, clean it with water to prevent the solution from remaining.

3. Blow or air dry the spring. It should be noted that in the chemical cleaning process to pay attention to protection, wear acid and alkali protective clothing, gloves, etc.

Electrochemical cleaning

Electrochemical cleaning method is an efficient method to remove spring rust, which needs to be cleaned by electrolyzer. The specific steps are as follows:

1. Prepare the electrolyzer and dip the spring into it.

2. The oxide on the surface of the spring is reduced by electrolytic action to restore the metal color.

3. Remove the spring, clean it, and neutralize it with urea and water.

4. Blow or air dry the spring.

Anti-rust treatment of spring surface: dehydration anti-rust oil

Analysis of possible causes of spring surface macular problem

① Before coating anti-rust oil on the surface of the spring, it is necessary to ensure whether there is rust on the surface, and any rust spots will have an impact on anti-rust.

② After industrial cleaning of the spring surface, whether it is rinsed (if there is no rinsing, there will be industrial cleaning agent residue on the surface), the cleanliness and dryness of the spring surface should be ensured after cleaning.

If the spring is cleaned with cleaning agent residue or undried residual water, the internal rust will be corroded after applying anti-rust oil.

③ Tempering after the spring, the spring surface temperature is too high, if the tempering is not cleaned before, it will lead to dirty residue on the spring surface and anti-rust oil curing on the surface, which is difficult to clean.

Suggestions to solve the spring surface macular problem

① After cleaning the spring, if the dryness of the surface cannot be guaranteed, you can apply a replacement type of anti-rust oil to replace the water on the surface, which may solve the problem.

② Clean the spring before treatment, the surface is oil-free, and look at the state after tempering, you will know whether it is the problem of oil or the problem of heat treatment.

③ It is recommended to replace the anti-rust oil with water-based anti-rust agent, which can reduce the risk of oil pollution. (The corresponding process also needs to be adapted to change according to the anti-rust products used)

Precautions for spring cleaning rust prevention

① The surface of the spring should be free of oil, no sweat, no dust impurities and chips, and heat treatment salt marks and other adhesives;

② The surface of the spring should be free of rust and corrosion before and after cleaning;

③ The spring should be fully dry and free of moisture after cleaning. And then rust prevention

④ The anti-rust of the spring can be used on the packaging of anti-rust bags or anti-rust desiccant for terminal anti-rust, to ensure that the anti-rust cycle of the spring meets customer requirements.

In short, for the spring rust problem, we can use a variety of methods to clean and remove rust. It is necessary to choose the appropriate method according to the actual situation to restore the spring to a good state of use.

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