Stainless steel pickling and passivation solution as well as preparation method and use method thereof

Abstract

The invention relates to the technical field of metal passivation, and specifically relates to a stainless steel pickling and passivation solution as well as a preparation method and a use method thereof. The stainless steel pickling and passivation solution comprises the following raw materials in percentage by weight: 14-22% of nitric acid, 3-7% of hydrofluoric acid, 0.6-1.0% of nonionic surfactant, 0.41-0.65% of corrosion inhibitor, 0.05-0.15% of oxidant, 0.03-0.07% of ionic surfactant and the balance water. The stainless steel pickling and passivation solution disclosed by the invention is capable of carrying out pickling and passivation on a stainless steel product under a normal-temperature condition, safe and environment-friendly, high in stability, good in pickling and passivation effects, and low in cost.

Description

technical field [0001] The invention relates to the technical field of metal passivation, in particular to a stainless steel pickling passivation solution and a preparation method and use method thereof. Background technique [0002] At present, the development of industrial cleaning technology has made great progress, and has successfully solved many practical problems in production practice. However, traditional stainless steel pickling agents generally use nitric acid or nitrates, phosphoric acid, etc. as pickling oxidants, and these The workpiece pickled by the pickling agent of the formula system not only has the problem that the weld bead is easy to turn white and gray, but also nitric acid, nitrate, and phosphoric acid are likely to cause deterioration of water quality. Nitride has seriously affected the health of operators, so the use of these system formulations has been limited to a certain extent. [0003] Chinese patent 200910147468.2 discloses a pickling corros...

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Problems solved by technology

[0002] At present, the development of industrial cleaning technology has made great progress, and has successfully solved many practical problems in production practice. However, traditional stainless steel pickling agents generally use nitric acid or nitrates, phosphoric acid, etc. as pickling oxidants, and these The workpiece pickled by the pickling agent of the formula system not only has the problem that the weld bead is easy to turn white and gray, but also nitric acid, nitrate, and phosphoric acid are likely to cause deterioration of water quality. Nitride has seriously affected the health of operators, so the use of these system formulations has been limited to a certain extent

[0003] Chinese patent 200910147468.2 discloses a pickling corrosion inhibitor for boiler cleaning. Its composition and mass percentage are: 2.0-10.0% acid solution, 0.08-0.25% urotropine, 0.04% xylene thiourea or thiourea ~0.15%, 0.01~0.05% thiocyanate, 0.03~0.12% dodecyl-hexadecylbenzyl chloride or bromide, 0.05~0.12% surfactant, and the balance is water; the acid solution is The following varieties and contents: hydrochloric acid 3.0-8.0%, citric acid 2.0-5.0%, sulfamic acid 5.0-10.0%, nitric acid 5.0-8.0%, phosphoric acid 8.0-10.0%, sulfuric acid 3.0-6.0%; the pickling agent is used for Cleaning the boiler will not cause needle-like pitting or expand and deepen the original corrosion spots, but the pickling agent is used to clean the boiler, which needs to be carried out at high temperature (above 45°C) and the cleaning time is as long as 2-10 hours

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