Natural green acid washing slow corrosion agent and its use

Abstract

The green acid washing corrosion inhibitor consists of berberine hydrochloride 80-98 wt%, epiberberine hydrochloride 0.1-10 wt% and jatrorrhizine hydrochloride 0.1-10 wt%. It is added into acid washing solution of dilute hydrochloric acid or dilute sulfuric acid of 0.1-2 M concentration and the added amount is 0.001-5 kg / cu m. The acid washing solution is then heated to 25-50 deg.c and used in acid washing of steel parts. The present invention can avoid the corrosion of steel, and compared with available acid washing corrosion inhibitor, the present invention has the advantages of low consumption, high corrosion inhibiting efficiency, and powerful lasting effect. The green acid washing corrosion inhibitor is harmful to environment and living being.

Description

technical field [0001] The invention relates to a natural green pickling corrosion inhibitor for preventing unnecessary overall corrosion and localized corrosion of steel and its products in the pickling process and application thereof, which belongs to the technical field of corrosion inhibitor production. Background technique [0002] Pickling with dilute sulfuric acid or dilute hydrochloric acid can remove the oxide film on the steel surface. This process is widely used in steel refining, boiler descaling, heat exchanger cleaning, etc. In order to avoid excessive consumption of metal or acid during pickling and prevent localized corrosion, adding corrosion inhibitors to acid is a commonly used and effective means. [0003] Among the currently widely used pickling corrosion inhibitors, there are mainly two categories: inorganic and organic. Most of these corrosion inhibitors are obtained by chemical synthesis. Some of them have certain toxicity and environmental hazards, s...

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Problems solved by technology

[0003] Among the currently widely used pickling corrosion inhibitors, there are mainly two categories: inorganic and organic. Most of these corrosion inhibitors are obtained by chemical synthesis. Some of them have certain toxicity and environmental hazards, such as poisonous chromate. Inorganic corrosion inhibitor compounds, the discharge of some organic phosphorus corrosion inhibitor compounds cause eutrophication of water bodies, etc.

[0004] Judging from the existing published patents of corrosion inhibitor formulas, some compounds in some corrosion inhibitor products are complicated to synthesize and expensive, which increases the user's cost of use, poor economic benefits, and weak market competitiveness