![]() ![]() Sulfuric acid, with a slower rate of attack, is heated. Hydrochloric acid, which attacks metal rapidly, is used cold. Hydrochloric and sulfuric acids are commonly used for ferrous surfaces. The most common acids used for pickling are hydrochloric acid and sulfuric acid. The pickling process can be done in a tank or vat, or it can be done by immersing the stainless steel in a bath of acid. Pickling is a process that uses acid to remove the rust and scale from the surface of stainless steel. The scale that is removed results from hot forming, welding, or heat treating operations and from corrosion. ![]() Pickling is an efficient process for the removal of scale, dirt, and oxides from materials. It is used to remove any high-temperature scale/ oxides & nearby low chrome from steel surface by the chemical application after welding. Pickling is a chemical treatment process for the removal of scales such as oxides from stainless steel material by immersion in a liquid containing sulfuric acid or hydrochloric acid. Passivation is generally carried out after pickling What is Pickling? Pickling is the first process for cleaning. Passivation does not remove any surface impurities. Pickling removes dirt’s, grease, oil, & oxides. Rate of material erosion is high & gives deep cleaning Passivation process does not erode material surface indeed increase the passive layer thickness. Passivation Pickling Passivation Highly aggressive cleaning Least aggressive & uses weak chemical acids. Pickling uses very strong acids such as H 2SO 4 (Sulfuric acids) and HNO 3 (Nitric acid) that remove material from the surface of the material for longer periods while passivation is carried out using HNO 3 (Nitric acid) only for short durations. Passivation does not remove any oxide or contamination but it helps to increase the thickness of the chromium oxide layer in an acidic environment (usually nitric acid or citric acid).Ī weld Before (Left side) and after (right side) Picking & passivation Usually picking is followed by passivation treatment for stainless Steel. This assists in the formation of the new chromium oxide layer and thus helps to regain its corrosion resistance that otherwise would be hampered due to oxides & contamination. Pickling and passivation both are chemical treatment processes used for surface treatment of stainless steel after welding or exposure to high temperature to clean the oxides and any other contamination. Difference between Pickling and Passivation Processes ![]() Pickling and Passivation of Stainless Steel is a chemical surface treatment processes to enhance the corrosion resistance feature of the stainless steel. Find expert insights and step-by-step guidelines for effective pickling and passivation techniques. Learn how these processes prevent corrosion and enhance durability. Discover the importance of pickling and passivation for stainless steel surfaces. ![]()
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