Potassium hydroxide has a wide range of uses. It is often seen and used in our daily life and consumption. Today we will understand the corrosion characteristics of potassium hydroxide when it stops.
Average corrosion is one of the common corrosion forms of potassium hydroxide industrial consumption equipment. It is the fundamental form of electrochemical corrosion. Average corrosion stops on the surface of all exposed media. The average metal thins and the weight gradually decreases.
Graphitization corrosion is that graphite in ordinary cast iron is dispersed in ferrite body in network shape, and selective corrosion of ferrite occurs in saline water, mineral water, soil or extremely dilute acidic solution.
Wear corrosion is caused by the relative movement of corrosive fluid and metal appearance, which causes the accelerated destruction of metal. It is the result of the joint or alternate stopping of corrosion and wear, chemical and mechanical action. Its severe corrosion level is far beyond the single corrosion process. Fluids in consumption usually coexist in gas, liquid and solid phases. Corrosion in soda plant is usually erosion corrosion, impact corrosion, cavitation corrosion and other types.
Erosion corrosion, also known as inlet pipe corrosion, mainly occurs at the inlet end of heat exchanger tubes. The main reason is that the fluid enters the small cross-section tubes from a large cross-section. The turbulence and crystalline fine particles produced by the turbulence stop the erosion at the end of the tubes violently, and the corrosion at the end of the tubes is quickly penetrated by the impact corrosion of potassium hydroxide, which is caused by a kind of wear corrosion at a higher flow rate. Cavitation corrosion, also known as cavitation corrosion, is caused by the composition and disillusionment of vapor bubbles, because the geometrical shape of metal equipment can not meet the requirements of fluid mechanics, part of which produces vortices, gas disillusionment at high pressure, and shock wave small holes and crevice corrosion is an electrochemical corrosion form of part of the metal surface that produces small holes or crevices. State.
In addition, the alkalinity of potassium hydroxide is much weaker than that of soda, caustic soda, etc. It can be sprayed on the products that need moisture-proof, which not only plays a moisture-proof role, but also has no effect on the quality of the products. However, some large central authorities with water throughout the year do not advocate using it. If the proportion of water and water is not proportional, it will not only play a related role, but also affect the surrounding environment.