Pickling Solution For Stainless Steel

Astm a380 practice for cleaning descaling and passivation of stainless steel parts equipment and systems defines pickling as a chemical treatment using strong corrosive acids that remove metallic contamination welding and heat treatment scales.

Pickling solution for stainless steel.

The most common pickling solution used to remove scale produced by annealing austenitic stainless steel in the air is 10 to 15 percent nitric acid plus 1 to 3 percent hydrofluoric acid. Pickling is a metal surface treatment used to remove impurities such as stains inorganic contaminants rust or scale from ferrous metals copper precious metals and aluminum alloys. Pickling is a very similar process to passivation. But pickling is a very imprecise process with many drawbacks including strict epa regulations around its use.

2 2 pickling pickling is the removal of a thin layer of metal from the surface of the stainless steel. The main form of steel pickling. Pickling is a pre passivation process of treating stainless steel parts with an acid solution typically hydrochloric or sulfuric acid which can remove oxide scale and heat tint while dissolving steel flecks embedded in the part. A solution called pickle liquor which usually contains acid is used to remove the surface impurities it is commonly used to descale or clean steel in various steelmaking processes.

During pickling direct current is applied to both sides of the steel immersed in the acid solution through the electrode to accelerate the removal of scale. Market leader john cockerill offers a comprehensive range of pickling solutions for long flat products eliminating scale and other impurities that form during the carbon stainless and silicon steel rolling process as well as when rolling non ferrous metals such as aluminium and copper. The solution is usually used at temperatures of 120 to 140 f 50 to 60 c. At present there are three main methods for pickling steel in the world.

If the pickling solution and the passivation solution can not remove the grease the grease on the surface will affect the quality of the pickling passivation. The pickling stage is central to the quality of the product during. Finishing treatments like passivation and pickling are what help stainless steels keep their corrosion resistance for so long. Stainless steel weld cleaning gel ss passivation chemical pickling passivation liquid manufacturer offered by krystal surface solution from mumbai maharashtra india.

Mixtures of nitric and hydrofluoric acids are usually used for pickling stainless steels. Pickling is the removal of any high temperature scale and the low chromium layer of the steel surface by a chemical treatment such as nitric or hydrofluoric acids. Processes on fabricated stainless steel parts further descaling operations are not usually necessary.