Rust is a chemical reaction when a metal material is oxidized due to long-term contact with oxygen in the air or is corroded by oxygen in the water to form an oxide. Certain minority metals, such as Al (aluminium), can slowly oxidize at room temperature to form a dense oxide film, which prevents further oxidation inside the metal and indirectly prevents rust. Al (aluminium) is more reactive than iron and easier to oxidize, but we rarely notice its rust because of this. The disadvantage of metal rusting is that the rust component is iron oxide, which is unstable. When welding iron alloys, iron alloys with oxides are not strong. For example, oxides are in the welding joints of bridge steel bars, which can easily cause fractures. Scaffolding in construction is made up of steel pipes connected. Rusty steel pipes will cause the pipe walls to become thinner and the hardness of the steel pipes to decrease. Such steel pipes can easily cause great safety hazards when used and also cause a waste of resources. So, we need to rust-proof the metal surface. The problem of rust prevention on metal surfaces has always been a global problem. Our country's national economic losses caused by metal corrosion account for 1%-4% of the national economy yearly, far exceeding the losses caused by geological and other disasters. Therefore, anti-rust treatment of metal surfaces is of great significance.

Covering the metal surface with a dense protective layer is a common and important method to prevent metal products from rusting.

1) Choose different protective layers according to the composition of the metal. 1: If it is an iron product, coat the surface with engine oil, Vaseline, paint or cover it with enamel, plastic and other corrosion-resistant non-metallic materials; 2: Use electroplating, hot plating or other methods to coat the surface of the steel with a layer that is not easily Corrosive metals such as zinc, tin, chromium, nickel, etc. These metal surfaces can form a dense oxide film to prevent iron products from rusting due to contact with water, air and other substances. Traditional metal surface treatment is mainly electroplating. However, its negative impacts, such as high energy consumption and high pollution, are also increasing.

2) Use electrochemical methods to form a dense and stable oxide film on the surface of iron products to prevent iron products from rusting. For example, a fine black ferrous oxide film is formed on the surface of machine parts and other steel parts. 1: Electrochemical protection method. Use the principle of galvanic cells to protect metals and eliminate galvanic cell reactions that cause galvanic corrosion. Electrochemical protection methods are divided into anode protection and cathodic protection. The most widely used method is cathodic protection. 2: Treat corrosive media. Eliminate corrosive media, such as frequently wiping metal equipment, placing desiccants in precision instruments, and adding a small amount of rust inhibitors that can reduce the corrosion rate to the corrosive media. The anti-rust processes on the steel surface include oxidation (blue or black), phosphating, and passivation. Oxidation (blue or black) is to put steel parts into a solution containing caustic soda, sodium nitrate or sodium nitrite to form a thin black oxide film on the surface of the parts; Phosphating is to put steel parts into Soak in phosphate solution to form a water-insoluble phosphate film on the metal surface; passivation is to put the metal into nitrite, nitrate, chromate, or dichromate solution to make the metal surface There are different options to form a passivation film according to specific anti-rust requirements.

3) Keeping the surface of iron products clean and dry is also a good way to prevent iron products from rusting. Manufacture various corrosion-resistant alloys, such as adding chromium, nickel, etc., to ordinary steel to make stainless steel.

In life. If some of the metal products we usually use are rusty, the simple choice is to remove the rust by grinding and then painting. If the product is used at room temperature and in industrial applications with general anti-rust requirements, you should choose pickling to remove the rust and then phosphating. Paint coating. Dilute sulfuric acid is generally used for pickling. If the rust is heavy, add some hydrochloric acid. The hydrochloric acid should be used cautiously to avoid causing new corrosion. For short-term rust prevention during storage, you can integrate rust removal and phosphating, wash and dry, and then apply anti-rust oil. You should choose a blackening treatment if it is a rust-proof product used at high temperatures.

This is a general overview of the anti-rust treatment methods for metal surfaces. There are huge professional disciplines and fields for each process. Specific details should be found in their professional manuals.

TR746 Dodecylene Succinic Acid as the main ingredients of rust inhibitor, it is used primarily for steam turbine oils, machine tool oils, hydraulic oils,hydraulic transmission oils, fuel oils and antirust grease, etc.

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