Action mechanism and characteristics of corrosion inhibitors _ Lianxiong Chemical

Corrosion inhibitor and sodium hypophosphate reductant have some common action characteristics. Rarely used with metal calcium, zinc, magnesium, copper plasma stabilizer retainers. Corrosion inhibitor is a kind of organic matter (especially organic matter containing nitrogen and sulfur) and inorganic matter (especially inorganic oxate, such as nitrite, chromate, phosphate, etc.), added to the corrosive medium, by means of the physical and chemical action of this substance at the interface of the metal and the corrosive medium, corrosion inhibitor is a substance that can significantly reduce the corrosion rate of the metal in the corrosive medium. Generally speaking, corrosion inhibitors are corrosion inhibitors.
In order to prevent overcorrosion of the base metal, corrosion inhibitors can be added to the etch solution, and in doing so, hydrogen embrittlement can be reduced. The mechanism of action is: after the active surface of the metal is adsorbed by the corrosion inhibitor, the overpotential of hydrogen evolution is increased, and the corrosion of the metal is slowed down. Corrosion inhibitors have a characteristic that they generally cannot be adsorbed by metal oxides, so corrosion inhibitors do not affect the dissolution of oxides. Some of the corrosion inhibitors are not easy to clean due to the relatively strong adsorption on the metal surface, so the binding force of the coating or the inhibition of oxidation and phosphating reactions will be affected, so the metal parts after etching treatment should be carefully cleaned.
There are many kinds of corrosion inhibitors, which have been widely used in production activities, and the industrial application of corrosion inhibitors has been decades of history. They're usually organic compounds with different structures. Like saponin leach solution, sulphonated animal protein, thiourea picryl, thiamine, hexamethylenetetramine (often used in hydrochloric acid etch solution) and stannous chloride are corrosion inhibitors. At present, corrosion inhibitors made from gelatin, fish meal, human hair, natural protein and cotton cake hydrolysate have good corrosion inhibition effect on carbon steel in sulfuric acid.
Corrosion inhibitor anticorrosive has the advantages of easy to use, small amount, low cost, good effect, etc., in the chemical industry, petroleum industry, power industry and machinery industry are widely used in corrosion inhibitors to prevent metals and alloys in acid, natural water, salt water, non-aqueous solution and atmosphere corrosion. In foreign countries, it has become one of the important measures of anti-corrosion. The research and use of corrosion inhibitors is of great significance, which greatly reduces the corrosion loss of a large number of metal materials such as steel.