Natural green acid washing slow corrosion agent and its use
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A technology of corrosion inhibitor and green acid, applied in the field of natural green acid pickling corrosion inhibitor, can solve the problems of increasing user cost, toxic environment of corrosion inhibitor, weak market competitiveness, etc. General corrosion and localized corrosion, low cost effect
Inactive Publication Date: 2006-03-22
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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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
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Embodiment 1
[0017] The corrosion inhibitor is calculated by weight percentage, and the berberine hydrochloride is 98%, the epiberberine hydrochloride is 0.1%, and the jatrorrhizine hydrochloride is 1.9%.
[0018] The pickling solution is dilute hydrochloric acid, the concentration is 0.1M, the amount of pickling solution is 100L, add 30g of corrosion inhibitor, raise the temperature to 40°C, add the steel to be cleaned, and immerse for 3 hours.
Embodiment 2
[0020] The corrosion inhibitor is calculated by weight percentage, including 96% of berberine hydrochloride, 1% of epiberberine hydrochloride, and 3% of jatrorrhizine hydrochloride.
[0021] The pickling solution is dilute hydrochloric acid, the concentration is 0.5M, the amount of pickling solution is 100L, add 45g of corrosion inhibitor, raise the temperature to 35°C, add the steel to be cleaned, and immerse for 2 hours.
Embodiment 3
[0023] The corrosion inhibitor is calculated by weight percentage, including 94% of berberine hydrochloride, 1% of epiberberine hydrochloride, and 5% of jatrorrhizine hydrochloride.
[0024] The pickling solution is dilute sulfuric acid, the concentration is 1M, the amount of pickling solution is 100L, add 90g of corrosion inhibitor, raise the temperature to 30°C, add the steel to be cleaned, and immerse for 2 hours.
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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...
Claims
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Application Information
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