Inhibited Acid Cleaning
Inhibited acid cleaning is a chemical cleaning process where metal surfaces are cleaned in acid solutions while special organic compounds adsorb at active cathode or anode sites, preventing uncontrolled base metal attack.
Physical-Chemical Mechanism of Action
Inhibited acid cleaning uses acid solutions to clean metal surfaces. During this process, special organic compounds (inhibitors) adsorb at active cathode or anode sites on the surface. This adsorption prevents direct contact between the metal and the acid medium, suppressing uncontrolled base metal attack.
Metallurgical Relevance & Welding Risks
Without inhibitors, contact between the metal and the acid cleaning solution can cause severe corrosion, damaging the surface and compromising weld quality. Using inhibitors reduces this corrosion, ensuring a cleaner and more stable metal surface.
Workshop Practice & Action Guidelines
Use special organic compounds in the acid cleaning solutions for inhibited acid cleaning. Make sure the Corrosion Inhibitor concentration is correct (typically 0.1% to 1%). Cleaning time should be between 5 and 30 minutes, depending on the metal type and desired cleanliness. After cleaning, dry the surface thoroughly to provide a clean base for welding.