The alkaline chemicals in the chemical degreasing solution of 304 stainless steel pipe surface are mainly as follows:
Sodium hydroxide: commonly known as tablet alkali or caustic soda, has a strong saponification ability. It also has a certain oxidation effect on the unpolished steel surface curvature, and the adsorption force is very strong, and it is not easy to wash with water.
Sodium carbonate: it is a basic salt, hydrolysis can release a small amount of alkali, so the aqueous solution is alkaline, 0.5% of the aqueous solution pH value of 11.83. It is an excellent carrier of the appearance of the active agent, which itself has a certain amount of too dirty talent, commonly known as soda ash, but the washability is not very good.
Trisodium phosphate: the aqueous solution is alkaline, and the pH of the aqueous solution is 11.8. It has a dispersing and wetting effect on dirt, has a good appearance activity effect, has little damage to the skin, is a detergent when wiped by hand, and has excellent washability.
Sodium silicate: commonly known as water glass and paulownia. Its humidity, emulsification, anti-flocculation effect are good, low price. After the 304 stainless steel tube is removed from oil, the sodium silicate should be thoroughly washed, otherwise it will constitute silicone during pickling, affecting subsequent processing.
Sodium pyrophosphate: the aqueous solution is alkaline, the pH of the 0.5% aqueous solution is 10.1, the appearance is good, the washability is good, there is chelating, and the insoluble dura water soap film is generated after the metal is dissolved.