Phosphorus-free scale and corrosion inhibitor simultaneously effective for copper and carbon steel

Abstract

The invention relates to a phosphorus-free scale and corrosion inhibitor simultaneously effective for copper and carbon steel. The scale and corrosion inhibitor comprises the following components in parts by weight: 5 to 15 parts of borate, 10 to 18 parts of gluconate, 8 to 12 parts of inorganic zinc salt, 0.5 to 2 parts of methyl benzotriazole, 8 to 19 parts of scale inhibitor, and 0.1 to 1 part of surfactant. The scale and corrosion inhibitor can protect copper and carbon steel of a system at the same time. After the scale and corrosion inhibitor is used, the corrosion speed of carbon steel is reduced to less than 0.02 mm / a, the corrosion speed of copper is reduced to less than 0.005 mm / a, and the inhibition rate can reach 98% or more. The scale and corrosion inhibitor has a good scale inhibition performance, and the scale inhibition rate is more than 90% in a fourfold concentration experiment. The provided scale and corrosion inhibitor solves the problems of scaling and corrosion of a system, the corrosion inhibiting performance and scale inhibiting effect are both better than national and industrial standards, moreover, the scale and corrosion inhibitor does not contain any phosphorus or rare earth element, zero discharge of phosphorus is realized, and the scale and corrosion inhibitor has a very high industrial value and generates good environment protection benefits.

Description

technical field [0001] The invention relates to the field of metal corrosion and protection and the field of industrial water treatment, in particular to a phosphorus-free scale and corrosion inhibitor which is effective for both copper and carbon steel. Background technique [0002] The recently released survey results show that the total cost of corrosion in my country's entire industry accounts for about 3.34% of the gross domestic product (GDP), reaching 2,127.82 billion yuan, which is equivalent to more than 1,555 yuan in corrosion costs for each citizen. Corrosion is a safety problem and a resource conservation problem, which needs to be solved urgently. Corrosion inhibitor is a chemical substance or a mixture of several chemical substances that can prevent or slow down the corrosion of metal surfaces when it exists in the environment (medium) in an appropriate concentration and form, and has been widely used in industrial water treatment. With the improvement of envi...

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Problems solved by technology

[0005] Patent 201010512464.2 discloses a phosphorus-free composite scale and corrosion inhibitor, containing sodium tetraborate, zinc gluconate, polyaspartic acid, polyepoxysuccinic acid, acrylic acid-hydroxypropyl acrylate copolymer, benzotriazole , zinc sulfate, etc., the corrosion rate of carbon steel treated with the prepared corrosion and scale inhibitor can reach 0.010mm / a, but the scale inhibition rate is low, basically not exceeding 85%.

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