Metal corrugated pipe surface treatment acid solution

Abstract

The invention relates-a metal corrugated pipe surface treatment acid solution. The metal corrugated pipe surface treatment acid solution is prepared from, by weight, 10-25 parts of hydrochloric acid, 10-25 parts of nitric acid, 0.10-0.20 part of polyethylene glycol, 0.30-0.64 part of peroxide, 0.10-0.20 part of regenerant, 0.80-1.20 parts of complexing agents, 0.09-0.13 part of imidazoline corrosion inhibitor, 2.00-4.00 parts of multifunctional additives and the balance water, totaling 100 parts. An acid pickling system is established through the hydrochloric acid, the nitric acid, the regenerant and the complexing agents, the problem that an existing acid pickling solution containing hydrofluoric acid is unsafe is directly solved, the corrosion amount of the acid solution is adjusted with assistance of peroxide, the imidazoline corrosion inhibitor and the multifunctional additives, and the corrosion degree of oxide skin of a workpiece can be controllable. The corrosion amount can be controlled within a certain range, and the purpose of improving the acid pickling quality is achieved.

Description

technical field [0001] The invention relates to the technical field of bellows processing, in particular to an acid solution for surface treatment of metal bellows. Background technique [0002] Metal bellows refers to metal pipes made of galvanized or non-galvanized low-carbon steel strips with spiral folded joints and used to reserve holes in post-tensioned prestressed concrete structural members. Traditional metal bellows are poor in stain resistance and corrosion resistance, and surface treatment is now mainly used to improve their surface properties. [0003] At present, the acid solutions for surface treatment of metal bellows mainly include the following types: 1) hydrochloric acid-sulfuric acid solution, the main components of which are sulfuric acid and nitric acid, both of which are strong acids, which corrode metal bellows very quickly and are easy to If the oxide scale has been corroded, it is difficult to guarantee the pickling quality of the metal bellows; 2) ...

AI Technical Summary

Problems solved by technology

[0003] At present, the acid solutions for surface treatment of metal bellows mainly include the following types: 1) hydrochloric acid-sulfuric acid solution, the main components of which are sulfuric acid and nitric acid, both of which are strong acids, which corrode metal bellows very quickly and are easy to If the oxide scale has been corroded, it is difficult to guarantee the pickling quality of the metal bellows; 2) Nitric acid-hydrofluoric acid solution, this type of pickling solution has a strong ability to dissolve the oxide scale and a certain loosening ability, and has a strong impact on the substrate. The corrosiveness of the metal bellows is relatively weak, and it is easy to control the erosion degree of the metal bellows, and the surface residue after pickling is less, but the hydrofluoric acid is volatile and has strong toxicity, irritation and corrosion to the human body. Conducive to safe and stable production

[0004] Therefore, the existing acid solution has the problems of difficult to control the erosion degree and unsafe acidic medium. It is urgent to optimize the formula of the acidic solution to reduce the damage of the acidic medium to the human body while taking into account the quality of pickling.

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