What are the types of fastener cleaning agents?

Ningbo Gangtong Zheli Fastener Co., Ltd. is a Chinese manufacturer that mainly produces high-strength standard fasteners. We sell tens of millions of tons of screws every year, so fasteners can only play a better role if they are cleaned and maintained frequently. Therefore, the protection of fastener performance is inseparable from cleaning agents. The following is an analysis of commonly used fastener cleaning agents and their working principles.

1. Decontamination agent

Decontamination cleaning agents mainly contain solvents, surfactants and water. Unlike emulsified cleaning agents, they are pure solutions, not emulsions. It is mainly used for maintenance cleaning of equipment and fastener outer packaging.

2. Synthetic cleaning agent

Synthetic cleaning agent is also an alkaline cleaning agent. The difference from standard alkaline cleaning agents is the chemical composition. Standard alkaline cleaning agents are essentially inorganic, while synthetic agents are organic agents containing amine substances. Standard alkaline cleaning agents are used to remove alkaline residues in single-stage cleaning, and they are also better rust inhibitors. Synthetic cleaning agents are used for medium-difficulty cleaning, such as cleaning quenching oil or quenching polymer solutions on the surface of fasteners.

3. Alkaline cleaning agent

Alkaline cleaning agent is a mixture of alkaline earth metal salts of builder and surfactant, and is the most widely used cleaning agent. 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 chelates. Each of the above salts and surfactants is mainly to ensure the cleaning effect, and secondly to be economical.

4. Acidic cleaning agent

Usually there are organic acids such as sulfuric acid, hydrochloric acid, nitric acid, citric acid, and acetic acid. For the removal of phosphating film before heat treatment of high-strength fasteners, the first three cleaning processes are currently mainly used, but hydrogen corrosion should be prevented. The acid agent should contain a basic acid and a corrosion inhibitor to prevent corrosion of the surface of the metal fastener, as well as a surfactant to improve the removal ability. However, acidic cleaning agents are generally not used to remove general dirt on metal fasteners, and alkaline cleaning agents are usually used. Acid cleaning is very effective for special attachments such as scale, and the most famous process is acid immersion. In addition to the oxide layer caused by rolling, welding and heat treatment, surface oxides, rust and corrosion products that affect the quality of electroplating or oil seals, as well as water stains and sediments can all be removed with acid.

5. Soluble emulsified cleaning agent

Soluble emulsifiers are usually composed of emulsifiers, soil, solvents, builders, corrosion inhibitors and a small amount of water. The role of water is to dissolve the emulsifier. While dissolving the dirt on the surface of the fastener, the cleaning agent also leaves a layer of rust-proof film on the surface of the fastener. Emulsified cleaning agent is a concentrated pure oil product. After diluting it in water, it becomes a white milky liquid. The emulsifier and detergent in it can grab the grease particles and dissolve them in the cleaning agent containing solvents and oils.