HF-Free Pickling
HF-free pickling uses non-toxic acid solutions instead of hydrofluoric acid to minimize toxic risks and protect the working environment.
Physicochemical Mechanism of Action
HF-free pickling is based on the use of non-toxic acids like citric acid or sulfuric acid. These acids react with the metal to form a scale layer and clean the surface. The process is less aggressive than HF pickling and causes less material loss.
Metallurgical Relevance & Risks in Welding
Using HF-free pickling reduces the emission of toxic chemicals, making the workplace safer. It also reduces the risk of burns and poisoning. However, the process may be slower and require higher temperatures to create an effective scale layer.
Workshop Practice & Action Instructions
Use non-toxic acid solutions like citric acid or sulfuric acid for pickling. Ensure the solution is correctly concentrated and the metal is properly cleaned. Allow sufficient dwell time of the scale layer to ensure a clean surface. Wear appropriate protective clothing and respiratory protection.