Steel high temperature treatment anti-oxidation layer high temperature anti-corrosion coating applications

Electrochemical analysis, the electrode electrode of the oxidation skin is 0.15-0.20V higher than iron, so China Paint Onlineresearchers specifically proposed that in the corrosion medium, iron before oxidation skin corrosion, especially when a large number of oxidizing skins exist, a large number of oxidizing skin for the cathode, a small amount of exposed iron becomes a small anode, will accelerate the corrosion of iron. In wet environments, large cathodes formed by oxidizing skins and small anodes formed by exposed steel can exacerbate local corrosion of steel in exposed areas. There are numerous small gaps between the oxide skin and the steel surface, and gap corrosion and deep differential corrosion occur when water and corrosion media penetrate into the loose oxidizing skin.
oxide skin is a dense layer of oxidation produced by steel at high temperature forging and forming, which is usually attached firmly, but is less flexible and tensurable than steel. Various corrosion media make steel oxidized and decarbonized at high temperature, resulting in huge loss of materials and reduced performance of the metal, so steel in high temperature treatment needs certain protective measures to reduce high temperature oxidation measures are: vacuum protection heating, controlled atmosphere protection, coating protection, etc., of which coating protection is a very economical and effective method. In view of the high temperature oxidation of steel in industry, a high temperature antioxidant coating resistant to high temperature closed coating, temperature resistance of up to 2300 degrees C, the coating isolated the air and steel surface contact, thus playing a protective role, while the anti-oxidation coating aluminum powder in the high temperature is oxidized to form A dense layer of alumina with a very high melting point (melting point is about 2050 degrees C) In this redox reaction, a vacuum area of the active gas is formed due to the large reaction of aluminum metal and active gases such as oxygen near the steel surface, thus protecting the steel surface from corrosion.
high temperature conditions, the coating is intact, the steel plate area of more than 95% non-oxidation phenomenon, the overall effect is very ideal. High temperature-resistant closed coating for metal heat treatment coating, can effectively shield the air of oxygen and other corrosive media penetration, low oxygen value, so that steel in a non-contact with corrosive media in the environment of heating, can avoid the oxidation loss of steel in heat treatment, reduce the removal of oxidation skin process, and make the specification size of the work piece More precise, can avoid the metal fatigue intensity due to decarbonization during heat treatment, extend the life of steel, can avoid the metal in the heat treatment surface absorption of gas, prevent the metal from being for oxygen and brittle, while enhancing the metal after heat treatment corrosion resistance, steel high temperature treatment antioxidant layer high temperature corrosion resistance recommended use.
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