Novel pickling corrosion inhibitor and application thereof in preparing metal pickling agent

Abstract

The invention discloses a novel pickling corrosion inhibitor O,O'-di-substituted dithiophosphate-N, N-diethyl ammonium. Two substituted groups are separately selected from the following substituted groups: aryl, substituted aryl and aryl substituted alkyl; and the carbon atom number of one of two substituted groups is less than 40. The invention also discloses application of the O,O'-di-substituted dithiophosphate-N, N-diethyl ammonium serving as a metal pickling corrosion inhibitor. The O,O'-di-substituted dithiophosphate-N, N-diethyl ammonium is added into a pickling medium with different concentration to make the concentration be between 40 and 160 mg / L so as to achieve the effective metal corrosion inhibiting effect; and the pickling corrosion inhibitor disclosed by the invention has long lasting effect and wide applicable acidity range.

Description

technical field The invention belongs to the technical field of metal pickling corrosion and protection, and particularly relates to the application of O, O'-disubstituted dithiophosphoric acid-N, N-diethylammonium as a metal pickling corrosion inhibitor. Background technique Corrosion is one of the challenges that all mankind needs to face. It is well known that metal corrosion is one of the most important aspects of corrosion. Metal corrosion not only brings huge economic losses to society, but also brings great harm to people's life and production. Therefore, people are constantly conducting research on metal pickling corrosion and protection, hoping to minimize the degree of metal pickling corrosion through efforts. At present, one of the most important and effective ways to reduce metal pickling corrosion in real life and production process is to add corrosion inhibitor in the pickling process. In recent years, significant progress has been made in the research of corr...

AI Technical Summary

Problems solved by technology

The applicant has applied for an invention patent on O, O'-dicyclohexyl dithiophosphate-N, N-diethylammonium as a pickling corrosion inhibitor. The Chinese patent application number is 201010114594.0, although O, O'-dicyclo Hexyl dithiophosphoric acid-N, N-diethylammonium overcomes the shortcomings of the above-mentioned existing pickling corrosion inhibitors to a certain extent, has good metal corrosion inhibition effect, and its corrosion inhibition effect is affected by temperature, acidity, etc. Less impact, can be used for pickling of various metals, wide application range, low cost, suitable for industrial promotion and application, etc. However, O, O'-dicyclohexyl dithiophosphoric acid-N, N-diethylammonium The duration of the corrosion effect is not long enough, and the applicable acidity range is not wide enough. It is necessary to further explore a new type of corrosion inhibitor for pickling that is better and more promising.

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