Potassium hydroxide is also known as caustic potash, caustic alkali and potash ash, etc., and its chemical equation is KOH. From its alias, we can understand the characteristics of potassium hydroxide: strong partial alkali and etching. Potassium hydroxide is soluble in strong electrolytes and releases a lot of heat. It is easy to absorb moisture in the air to produce deliquescent, and it will continue to absorb carbon dioxide in the air to become ammonium bicarbonate.

Potassium hydroxide cleaning actually uses its strong partial alkali to loosen, emulsify and disperse the deposits in metal machinery and equipment, and then achieve the purpose of cleaning up the stains of machinery and equipment, but alkaline cleaning cannot remove general scale and electrochemistry. Corrosive chemicals.

The principle of potassium hydroxide removal of oil stains is actually a simple chemical principle. Since oil stains are a lipid chemical substance, from the analysis of its chemical composition, they are higher fatty acids and glycerides. This chemical substance will undergo a hydrolysis reaction when it encounters alkali, acid, and enzymes. After the hydrolysis reaction, petrolatum and higher fatty acids will be formed, and this petrolatum and oleic acid will be melted by water and washed away. This is what everyone said Remove the oil stains.

The removal of oil stains by potassium hydroxide is the reaction between alkali and water. The following is the chemical equation of the soda ash hydrolysis reaction:

Primary hydrolysis reaction: Na2CO3+H2O=NaHCO3+NaOH

Secondary hydrolysis reaction: NaHCO3+H2O=H2CO3+NaOH

Due to the hydrolysis reaction of potassium hydroxide, potassium hydroxide is often used in the following aspects: (1) to remove oil stains on the system software or the surface; (2) to replace the application with acid, to remove calcium bicarbonate and calcium silicate and other acid cleaning Difficult to remove stains; (3) Alkaline washing after pickling passivation is used to neutralize the residual acid in water and machinery and equipment, thereby reducing the corrosion of metal machinery and equipment.