Common pickling corrosion inhibitors include the following:
Nitric acid (HNO3): Nitric acid is a strong oxidizing acid that can be used to remove oxides and rust on metal surfaces. It can react quickly with metals, resulting in deoxygenation and cleaning of the metal surface.
Phosphoric acid (H3PO4): Phosphoric acid is a medium strength acid with good deoxygenation and corrosion inhibition properties. It can react with oxides on the metal surface and form a protective phosphate film.
Non ionic corrosion inhibitors (such as organic acids): Non ionic corrosion inhibitors can form a protective molecular film by adsorbing on the surface of metals, thereby preventing direct contact between metals and acidic media. These organic acids usually have good corrosion inhibition performance and surface activity, which can prevent corrosion of metal surfaces.
Corrosion inhibitor composite: Sometimes acid pickling corrosion inhibitors use a composite formula of multiple compounds to improve corrosion inhibition effect and adapt to different metal materials. These complexes typically include multiple coordination ions and complexing agents, which can form a protective film and provide better corrosion inhibition performance.
Appropriate pickling corrosion inhibitors need to be selected based on specific pickling requirements, metal materials, and operating conditions. When using acid pickling corrosion inhibitors, product instructions and safety operating procedures should be followed, attention should be paid to controlling dosage and processing time, and necessary post-treatment and waste liquid treatment should be carried out to ensure safety and environmental protection.