How To Remove Oil Stains On China Fasteners

      The newly purchased China fasteners are of course very clean, but the fasteners will inevitably stick to oil after a period of use. How to solve the oil stain on China fasteners? The following manufacturers of China fasteners will explain to you.

　　Soluble emulsifiers usually contain soil, solvents, emulsifiers, builders, corrosion inhibitors, and a small amount of water. The function of water is to dissolve the emulsifier, the cleaning agent can dissolve the dirt on the surface of the precision screw, and it can also leave an anti-rust film on the surface. The emulsifier and detergent can hold the grease particles and dissolve them into the cleaning agent containing solvent and oil. The emulsified cleaning agent is a concentrated pure oil product, which becomes a white milky liquid after being diluted in water.

　　The synthetic cleaning agent is different from the standard alkaline cleaning agent. The difference lies in the chemical composition. It is also an alkaline cleaning agent. Standard alkaline cleaning agents are inorganic, while synthetic agents are organic agents containing amine-based substances. These products are designed to remove alkaline residues from single-stage cleaning and are also good rust inhibitors. Synthetic cleaning agents are used for moderately difficult cleaning, such as quenching oil or quenching polymer solution for cleaning the surface of precision screws.

　　The alkaline cleaning agent is a mixture of builders and alkaline earth metal salts of surfactants. It is a widely used cleaning agent. The starting point for adding each salt and surfactant is mainly to ensure the cleaning effect, followed by economy. The pH value of the cleaning agent is required to be around 7. The cleaning ingredients of this type of cleaning agent are hydroxides, silicates, carbonates, phosphates, borates, and organic chemicals.

　　Hydroxide can provide high alkalinity and is relatively inexpensive. A small amount of addition can have sufficient alkalinity and conductivity, which is very important for electrolytic cleaning and saponification. The disadvantage is that it is difficult to rinse, and the non-saponified cleaning effect of dirt is not good. The pH value of a 1% solution can reach 1.3. The alkaline cleaning solution can be sodium salt or potassium salt, which is mainly used for cleaning steel alloy screws. Decontamination cleaning agents mainly contain solvents, surfactants, and water. Different from emulsified cleaning agents, it is a pure solution, not emulsified.

It is not an effective method to remove the general dirt on precision screws with acidic cleaning agents. Alkaline cleaning agents are usually used. Acid cleaning is very effective for special attachments such as oxide scale. The well-known process is acid leaching. In addition to rolling, welding and heat treatment of the oxide scale layer, surface oxides, rust and corrosion products that affect the quality of electroplating or oil seals, and water-stained deposits can all be removed with acid. Commonly used are sulfuric acid, hydrochloric acid, nitric acid, citric acid, acetic acid, and other organic acids. For the dephosphorization of high-strength precision screws before heat treatment, the first three cleaning processes are mainly used at present, but hydrogen corrosion should be prevented. The acidic agent should contain basic acid and corrosion inhibitors to prevent erosion of the surface of precision screws, as well as surfactants to improve the removal ability.