Ascorbic acid phosphorus-free corrosion and scale inhibitor, and preparation method thereof

Abstract

The invention discloses an ascorbic acid phosphorus-free corrosion and scale inhibitor which is applicable for treatment of industrial circulating cooling water. The corrosion and scale inhibitor is prepared by compounding a maleic acid compound, an acrylic acid terpolymer, ascorbic acid, a sulfamic acid compound, a zinc salt, a gluconate and distilled water. The ascorbic acid phosphorus-free corrosion and scale inhibitor provided by the present invention provides good corrosion inhibition and scale inhibition effects for carbon steel equipment. The dosage of the phosphorus-free corrosion and scale inhibitor is 20 mg.L<-1> - 50 mg.L<-1> in the industrial circulating cooling water having an alkalinity less than 400 mg.L<-1>, a hardness less than 500 mg.L<-1>, a pH value less than 8.2, a conductance controlled from 0[mu]s.cm<-1>-2400[mu]s.cm<-1>. A plurality of experiment results show that the corrosion and scale inhibitor provides a annual corrosion rate lower than 0.04 mm.a<-1> and a calcium carbonate inhibition rate higher than 98% for the A3 carbon steel. Advantages of the ascorbic acid phosphorus-free corrosion and scale inhibitor and the preparation method are as follows: the discharged waste water during using the corrosion and scale inhibitor does not provide a eutrophic pollution caused by phosphor for water body; the environment is environment-friendly; agent cost for treating each ton of the water is less than 0.12 yuan; the product preparation process is simple.

Description

technical field [0001] The invention relates to a phosphorus-free ascorbic acid corrosion and scale inhibitor and its preparation, which is a phosphorus-free, biodegradable and environment-friendly corrosion and scale inhibitor suitable for industrial circulating cooling water treatment systems. Background technique [0002] Since entering the 21st century, the sustainable development strategy has become the consensus of all countries in the world. The three major problems facing the sustainable development of today's society are population expansion, resource shortage, and environmental degradation. To realize the harmonious development between man and nature, it is necessary to save resources and reduce the waste of resources caused by corrosion. The use of corrosion and scale inhibitors is a better anti-corrosion and scale-inhibiting method, which can play a big role in protecting resources and reducing material loss. [0003] In the past 30 years, my country's economy ...

AI Technical Summary

Problems solved by technology

Industrial circulating cooling water has the following characteristics: (1) The concentration of ions in industrial circulating cooling water is generally 4 to 5 times, and the scaling ion Ca 2+ , Mg 2+ 、HCO 3 - Such a large increase will easily cause fouling of the equipment, affect the heat conduction of the equipment, and easily cause production accidents; (2) The concentration of corrosive ions is also increasing, and the corrosion effect on the equipment will be enhanced, affecting the service life of the equipment

[0004] With the strengthening of environmental protection and safety awareness, some harmful and toxic corrosion and scale inhibitors will be restricted and banned

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