Corrosion Inhibitors
Inhibitors are chemical additives added in small amounts to the corrosive medium. They slow down the electrochemical attack through adsorption or film formation.
Physicochemical Mechanism of Action
Inhibitors react with the metal surface and form a thin protective layer. This layer prevents electrolytes from directly reaching the metal and starting a corrosion process. Inhibitors can also show adsorption effects, where they bind to the metal surface and suppress the attraction of hydrogen ions.
Metallurgical Relevance & Welding Risks
Inhibitors play an important role in preventing corrosion during and after welding. They protect the weld from ambient moisture and other corrosive substances, which increases the service life and appearance of the component. Missing or too few inhibitors can lead to accelerated corrosion, which can cause cracks, deterioration of mechanical properties, and possibly premature replacement of the component.
Workshop Practice & Action Guidelines
Inhibitors should be used in small amounts in the weld material or directly on the metal surface. The exact amount and type of Corrosion Inhibitor depends on the metal used, the environment, and specific requirements. It is important to follow the manufacturer's instructions. In strongly corrosive environmental conditions or for long-term storage of welding consumables, additional inhibitors should be used.