Chitosan modified derivative corrosion inhibitor and preparation method thereof

Abstract

The invention belongs to the field of metal corrosion and protection and particularly relates to a chitosan modified derivative corrosion inhibitor and a preparation method thereof. Application of the modified derivative to other fields such as the biological field and the medicine field is not subjected to related verification or illustration. The chitosan modified derivative corrosion inhibitor is carboxymethylation hydroxypropyl chitosan, that is, chitosan is modified through carboxymethylation and hydroxypropylation, a carboxymethyl group and a hydroxypropyl group are introduced, and the chitosan derivative with multiple substituent groups is obtained. The environment-friendly chitosan modified derivative corrosion inhibitor and the preparation method thereof are applicable to a corrosive medium, the production process is simple, the raw material source is wide, and the chitosan modified derivative has good water solubility and biocompatibility.

Description

technical field [0001] The invention belongs to the field of metal corrosion and protection, in particular to a chitosan modified derivative corrosion inhibitor and a preparation method thereof. Background technique [0002] Corrosion is an important destructive factor in modern industry and life, and the annual corrosion loss in my country accounts for about 6% of the gross national product. At present, there are many anti-corrosion methods such as surface coating, surface treatment, electrochemical protection, etc., and the addition of corrosion inhibitors is a method with simple process, low cost and strong applicability. Widely used in various fields. With the advent of the ocean century, more and more attention has been paid to the development and utilization of seawater resources, but seawater will cause huge economic losses due to its strong corrosiveness. Playing an increasingly important role, corrosion inhibitors can be divided into inorganic and organic types ac...

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Problems solved by technology

Sodium nitrite can generate insoluble dense oxides on the surface of steel, causing the metal surface to change from an active state to a passive state, and has a good anti-rust effect, but it is carcinogenic and its use is limited

The corrosion inhibition effect of chromium corrosion inhibitor is very good at a certain dose, but its concentration as an anodic corrosion inhibitor is insufficient or too high, it will cause serious corrosion to metal, and its toxicity is high, so its use has been restricted

Phosphorus-based corrosion inhibitors mainly include inorganic phosphates such as orthophosphorus and polyphosphorus, and organic polyphosphonic acid, phosphorus carboxylic acid, polyphosphate, etc., which have a corrosion inhibitory effect on steel, but due to the aggravation of eutrophication in water bodies around the world, phosphorus become a major emission control object, which restricts its use

Molybdenum-based corrosion inhibitors have high corrosion inhibition efficiency, low toxicity, and good stability, and are suitable for use under high pH, ​​high hardness water and high temperature conditions; however, the single use of molybdenum-based corrosion inhibitors has too much dosage and high cost shortcoming

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