Pickling solution formula

Acid Mixtures The following dilute acids can be used to pickle pipes made from carbon steel, stainless steel or copper: Concentration Temperature 1) Orthophosphoric acid (H3PO4) 8 – 20 % 20 – 60 °C 2) Amino-sulphonic acid (NH2SO3H) 5 – 15 % 20 – 40 °C 3) Sulfuric acid (H2SO4) 10 – 20 % 20 – 60 °C 4)* Hydrochloric acid (HCl) 5 – 20 % 20 – 60 °C * Do not use hydrochloric acid for the cleaning of pipe assemblies made of carbon and stainless steels. A normal commercial inhibitor must be added to the pickling solution to protect the base material. For orthophosphoric and sulfuric acids: Mulgoten 3482 at 0.4 %; for hydrochloric acid: Rodine 213 at 0.3 – 0.4 % or propargyl alcohol at 0.4 %. The time required for acid pickling depends on the solution temperature – the higher the temperature of the acid solution, the faster the cleaning process. Depending on the temperature and concentration of the solution, acid pickling takes between two and twelve hours. It is recommended to determine the appropriate pickling time by using sample pipes.

First, clean with hot alkali and degreaser, then clean with acid, and finally carry out passivation treatment.

Try this: use trisodium phosphate and sodium hydroxide for conventional alkaline cooking. If there is a large amount of oil, use a higher concentration; for trial tests, you can conduct experiments using tubes. Acid washing and passivation are too simple to mention here

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