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Seawater corrosion inhibitor

A corrosion inhibitor and seawater technology, applied in seawater treatment, descaling and water softening, complex/solubilizer treatment, etc., can solve problems such as slow development, poor corrosion inhibition effect, and little consideration of environmental protection issues

Inactive Publication Date: 2012-09-19
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the 1950s, experts at home and abroad have conducted a lot of research on carbon steel corrosion inhibitors in seawater. These studies focus on improving corrosion inhibition efficiency and rarely consider environmental issues.
In the 1990s, many scholars began to pay attention to environmentally friendly seawater corrosion inhibitors, but the development was relatively slow
However, when polyaspartic acid is used alone in seawater, its corrosion inhibition effect is not good

Method used

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Effect test

Embodiment 1

[0028] According to the mass ratio of 8:1:5:0.5, polyaspartic acid, hexadecyldimethyl (2-sulfite) ethyl ammonium, zinc sulfate and 2-hydroxyphosphonoacetic acid are compounded to form an environmentally friendly seawater buffer. Etching agent, dosage is 145mg / L. The test results show that the corrosion rate of A3 carbon steel in seawater is 0.0215mm / a, the blank corrosion rate is 0.7465mm / a, the corrosion inhibition rate is 97.12%, and the biodegradation rate after 28 days is 81.36%.

Embodiment 2

[0030] According to the mass ratio of 6:1:5:0.5, polyaspartic acid, hexadecyldimethyl (2-sulfite) ethyl ammonium, zinc sulfate and 2-hydroxyphosphonoacetic acid are compounded to form an environmentally friendly seawater buffer. Etching agent, dosage is 125mg / L. The test results show that the corrosion rate of A3 carbon steel in seawater is 0.0522mm / a, the corrosion inhibition rate is 93.01%, and the biodegradation rate after 28 days is 83.43%.

Embodiment 3

[0032] According to the mass ratio of 8:1:5:0.25, polyaspartic acid, hexadecyldimethyl (2-sulfite) ethyl ammonium, zinc sulfate and 2-hydroxyphosphonoacetic acid are compounded to make an environmentally friendly seawater buffer. Etching agent, dosage is 142.5mg / L. The test results show that the corrosion rate of A3 carbon steel in seawater is 0.0351mm / a, the corrosion inhibition rate is 95.3%, and the biodegradation rate after 28 days is 84.5%.

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Abstract

The invention discloses an environmental-friendly seawater corrosion inhibitor for seawater circulating cooling water treatment, belonging to the technical field of chemical products. The seawater corrosion inhibitor is formed by mixing polyaspartic acid, hexadecyldimethyl (2-sulphite) ethyl ammonium, zinc sulfate and 2-hydroxy phosphonoacetic acid according to mass ratio of (4-8): (0.6-1): (3-5): (0.25-0.5). The seawater corrosion inhibitor has excellent corrosion inhibition performance in high-hardness, high-chloride-ion-concentration and high-corrosion water such as seawater, the dosage of the seawater corrosion inhibitor in a seawater circulating cooling water system is 78.5mg / L-145mg / L, the seawater corrosion inhibitor is biodegradable, the degradation ratio after 28 days can reach more than 80 percent and the seawater corrosion inhibitor is an environmental-friendly product. The seawater corrosion inhibitor is not required to be pre-filmed during use and is convenient to use, and the cost is saved.

Description

technical field [0001] The invention relates to an environment-friendly seawater corrosion inhibitor used for seawater circulating cooling water treatment, and belongs to the technical field of chemical products. Background technique [0002] As the crisis of fresh water resources intensifies, it is of great significance to use seawater as supplementary water in the circulating cooling water system, but seawater has the characteristics of complex composition, high salt content, and many types of microorganisms, so seawater is more corrosive than fresh water. The strong corrosiveness of the water will lead to serious corrosion of the pipes and heat exchange equipment of the circulating water system. Therefore, solving the corrosion of carbon steel in seawater is the key to using seawater for circulating cooling water, and adding corrosion inhibitors is an effective way to solve this problem. The earliest seawater corrosion inhibitor was proposed by Clay of England in 1946, a...

Claims

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Application Information

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IPC IPC(8): C02F5/08C02F5/14C02F103/08
CPCC23F11/08
Inventor 刘振法高玉华王昕张利辉
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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