Corrosion Inhibitors

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Corrosion inhibitors are also called corrosion inhibitors. Where added to the water can interfere with the electrochemical effects of corrosion, preventing or reducing the rate of decay of metals of a class of substances is called corrosion inhibitors. Its role is to prevent corrosion by forming a protective film on the metal surface.

Corrosion inhibitors in the appropriate concentration and form in the environment (medium) can prevent or slow down the material corrosion of chemical substances or complexes, so corrosion inhibitors can also be called corrosion inhibitors. It is a tiny amount (0.1% to 1%), but the effect is significant.

This method of protecting metals is called corrosion inhibitor protection.  Corrosion inhibitors in neutral media (boiler water, circulating cooling water), acidic media (hydrochloric acid to remove pot scale, acid dip solution for rust removal of plated parts before plating), and gaseous media (gas phase corrosion inhibitors).


What are corrosion inhibitors give examples?

Some examples are chromates, nitrates, molybdates, and tungstates. These inhibitors slow down the cathodic reaction to limit the diffusion of reducing substances to the metal surface. Cathodic poisons and oxygen scavengers are examples of such inhibitors.

Common corrosion inhibitors are magnesium and aluminum corrosion inhibitor DX5819, multi-functional corrosion inhibitor DX5810. The characteristics are corrosion inhibition for non-ferrous metals, effective prevention of aluminum mold, color loss, graying, oxidation blackening, and other problems. For ferrous metals with excellent rust resistance, effective prevention of magnesium can be used as corrosion inhibitors or directly as additives to metalworking fluids.


What are the types of corrosion inhibitors?

Types of corrosion inhibitors

Cathodic inhibitors.

Anode inhibitors.

Volatile corrosion inhibitors.

Mixed inhibitors.


1.according to the chemical composition of the agent, it generally can be divided into inorganic corrosion inhibitors and organic corrosion inhibitors, two categories.


2. According to the role of agents on the electrochemical corrosion process to be divided into different, can be divided into anodic corrosion inhibitors (such as chromate, nitrite, etc.) and cathodic corrosion inhibitors (such as polyphosphate, zinc salts, etc.) and cathodic corrosion inhibitors (such as organic amines) three. Anodic corrosion inhibitors and cathodic corrosion inhibitors can stop the anodic or cathodic process respectively, while cathodic corrosion inhibitors can prevent the cathodic and anodic process at the same time.


How do corrosion inhibitors work?

The role of corrosion inhibitors.

a, organic corrosion inhibitors through the interface to play a role in corrosion inhibition

Studies have found that hydroxyl, aldehyde, carboxyl, and other groups of corrosion inhibition effect second to the triple bond and that the mechanism of unsaturated organic substances and the initial stage of the corrosion process related to the reduction of hydrogen. Tests in the use of such corrosion inhibitors, the actual loss of metal, and the value calculated by the amount of hydrogen precipitation are very different. The substantial loss of metal is always more than the theoretical value calculated by the amount of hydrogen precipitation. This test indicates that hydrogen in the corrosion process is part of the corrosion inhibitor in the interface conversion and does not reduce it. That is, to verify the role of the conversion mechanism in the corrosion inhibition process.

b, the role of polymer film corrosion inhibition

Some corrosion inhibitors can react at the interface to form a polymer film, thus playing a protective role in the material. Polymer protective film is stable, and therefore its temperature range is wide. The corrosion inhibition effect of this kind of corrosion inhibitor polymer film is much better than the corrosion inhibition effect of its monomer. Generally, to achieve the same corrosion inhibition effect, the two concentrations can differ by several orders of magnitude.

c, organic corrosion inhibitors to form a protective film of surface complexes

The corrosion inhibitors contain amino, hydroxyl, mercapto, carboxyl, and other polar groups in the molecule, by forming a ligand chelate film with the metal surface ions to play a protective role. These surface complexes have a stable structure and low solubility and can play a protective role. The film generated on the material's surface should be very dense and well adsorbed on the material's surface.


What is the most common corrosion inhibitor?

The most common inhibitors in this category are silicates and phosphates. These inhibitors will have more advantages because they can control both cathodic and anodic corrosion reactions.

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