The role of pickling in metal etching

The role of pickling in metal etching

After the metal workpiece is chemically degreased, the workpiece is immersed in a special pickling solution for cleaning.The purpose of pickling the workpiece after oil removal: (1) neutralize the alkaline oil removal;By pickling the workpiece in the alkaline or acidic oil removal produced by the insoluble attachment to clean, so that the whole surface of the workpiece to form a clean surface.The insoluble attachments on the surface of the workpiece are the oxides of its own materials and impurities or other insoluble salts formed during the chemical deoiling process. Most of these insoluble oxides or salts dissolve in strong acids.

Pickling of metal surface is not only for pickling after removing oil, but also for pickling after processing in the whole process of metal etching.However, the passivation and chemical oxidation can not be pickling, this is an exception.Pickling is usually done by immersion pickling with an pickling tank and its associated water bath, or by a combined cleaning system consisting of jet or ultrasonic washing.The use of this combined cleaning system can clean the surface of complex workpiece thousands of clean, but also can shorten the operation time, especially a reasonable water cleaning system can do in the premise of cleaning to reduce the use of water, thereby reducing the load and cost of the wastewater treatment system.

Metal pickling category for the steel dilute hydrochloric acid and chromic acid, for copper and alloy can use dilute hydrochloric acid or dilute sulphuric acid, nitric acid and sulfuric acid can be used for aluminum alloy + hydrogen peroxide, cast aluminum kind of nitric acid can be used with a moderate amount of fluoride mixed acid, nitric acid can be used for titanium fluoride mixed acid, can be used for stainless steel pickling of chromic acid and nitric acid or nitric acid and ammonium hydrogen fluoride.The pickling discussed here is only limited to the pickling after oil removal and the roughening mentioned in this section. It is mainly used to neutralize and dissolve surface oxides or insoluble salts to obtain a clean surface.Acid etching or etching is more corrosive than pickling, and this strong corrosion is not required here.There is another name for pickling, that is, "acid gives out light", and the pickling in question means "acid gives out light".The pickling process is also used during the intermediate inspection stage of the metal etching process and after the etching is finished and the corrosion resistant layer is removed. The pickling process is consistent with the pickling discussed here in nature and requirements.

The pickling method can be divided into soaking pickling method and spray pickling method according to its working principle.The latter equipment is complicated, the investment cost is high, but the spray pickling method pickling efficiency is high, pickling effect is good.The selection of these two methods should be decided according to the requirements of the products and the conditions of the enterprise itself, and the corresponding equipment should be added.For immersion pickling cylinder can be made of hard PVC or PP.

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