The working principle of acid pickling corrosion inhibitor

Pickling corrosion inhibitor is a chemical additive used for pickling metal surfaces, which can reduce the corrosion rate of metal during pickling and reduce metal loss. The basic working principle is as follows:

Forming a protective film: The active components in the pickling corrosion inhibitor can react chemically with the metal surface, forming a dense protective film. This protective film can block direct contact between metal surfaces and acids, reducing the corrosion of metals by acids.

Obstruction of metal ion release: Some components in acid pickling corrosion inhibitors can react with oxides or other insoluble substances on the metal surface to form soluble complexes. These complexes can hinder the release of ions on the metal surface, reduce the electrochemical reaction rate, and thus reduce metal corrosion.

Inhibiting the catalytic effect of acid: During the pickling process, the acid can have a catalytic effect, accelerating the corrosion reaction on the metal surface. And acid pickling corrosion inhibitors can inhibit the catalytic effect of acids and reduce the corrosion rate of metals by reacting with catalysts in the acid.

Overall, acid pickling corrosion inhibitors reduce acid corrosion of metals, improve the cleaning effect of metal surfaces during the pickling process, and reduce metal loss by forming protective films, hindering the release of metal ions, and inhibiting the catalytic action of acids. It should be noted that when using acid pickling corrosion inhibitors, appropriate additives, concentrations, and operating conditions should be selected based on the specific situation, and relevant safety operating procedures should be followed.