Spray Pickling
Spray pickling is a process in which pickling media are sprayed onto components through nozzles to remove oxide layers and heat tint. It allows uniform wetting of complex geometries without full immersion.
Physical-Chemical Mechanism of Action
Pickle spraying uses nozzle pressure to break down pickling media into fine sprays. These sprays hit the workpiece surface and react with oxide layers or heat tint, dissolving and washing them off.
Metallurgical Relevance & Risks in Welding
Pickle spraying is especially important before welding to clean the surface and remove any contaminants. Incomplete or faulty pickling can lead to porosity and reduced weld strength. Also, a nozzle that's too strong can damage the surface, causing cracks or distortion.
Workshop Practice & Instructions
Use a spray pickling machine with suitable nozzles and pickling agent. Make sure the pressure and nozzle are set to get even wetting without damaging the surface. Start from the top down and work toward the weld point. Check the surface thoroughly before welding for contaminants.