Two ways to reduce the corrosion of corrosion equipment

First, remove the corrosive substances in the environment

1, remove other harmful ingredients - to prevent the production of corrosive acid gas

In some process of refining process, can be pre-desalination device.

2, remove the water - to prevent the indoor atmosphere of corrosion

An effective method is to rely on the dehumidification of the atmosphere so that the metal surface is often maintained above the dew point. Corrosion of the interior of the anti-corrosion equipment will control the moisture content below a certain level. For example, in the transport of carbon dioxide, hydrogen sulfide, chloride and other media, the pre-dehydration device.

3, remove the dissolved oxygen in the water - to prevent neutral water caused by carbon steel corrosion

Mechanical deaeration can be used or added deoxidizing agents such as hydrazine, sodium sulfite and so on

Second, in the environment to add anti-corrosion effect of the ingredients

1, add neutralizer

By adding neutralizer PH value adjustment, sodium hydroxide, sodium carbonate, ammonia and other acids can be effectively avoided corrosion, but the use of proper methods to avoid the occurrence of alkaline embrittlement and other material degradation.

2, add anti-corrosion agent

Corrosion environment in a small amount of corrosion inhibitor added to form a protective film on the metal surface, can significantly inhibit the rate of metal corrosion to achieve a certain anti-corrosion effect.

Such as adding chromate, molybdate, nitrite can be formed in the corrosion protection of metal surface oxide film, adding phosphate, phosphate, zinc salts, thio-benzothiazole, benzotriazole corrosion metal surface can be Form a precipitate protective film; amine surfactants can be added to the surface of the metal corrosion preservative equipment to form a protective film. Tetracycline anti-corrosion equipment

However, in the use of such inhibitors, the concentration of the added requirements are very strict.

3, add passivation agent

Such as stainless steel, titanium, etc., for hydrochloric acid, sulfuric acid and other non-oxidizing acid, poor corrosion resistance, can be added by adding oxygen and chromic acid, nitric acid, Fe3 +, Cu2 + and a small amount of oxidant can significantly reduce corrosion of corrosion protection equipment.