. Fabrications: After degreasing, metallic surface contaminants such as iron embedded in fabrication shop forming and handling, weld splatter, heat tint, inclusions and other... metallic particles must be removed in order to restore the inherent corrosion resistance of the stainless steel surface. Nitric-HF pickling, (10% HNO3, 2% HF at 49C to 60C (120 to 140F...), is the most widely used and effective method removing metallic surface contamination. Pickling may be done by immersion or locally using a pickling paste. Electro polishing, using...