Green compound corrosion inhibitor for inhibiting corrosion of carbon steel in seawater

A corrosion inhibitor and seawater technology, which is applied in the field of green compound corrosion inhibitors, can solve the problems of low corrosion inhibition efficiency, crevice corrosion of protective film, limited promotion and large-scale use, etc.

Inactive Publication Date: 2021-02-23
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2) The content of chloride ions in seawater is high, and the chloride ion penetration is extremely strong, and it is easy to penetrate the protective film on the surface of carbon steel to cause crevice corrosion and pitting corrosion
[0005] 3) The adsorption of microorganisms in seawater on the surface of carbon steel can cause serious microbial corrosion
A single inorganic salt corrosion inhibitor is used in a large amount in seawater. Although some corrosion inhibitors have good effects, they have different degrees of damage to the environment, such as chromate, etc.; a single organic compound has low corrosion inhibition efficiency in seawater. The high cost also limits its further promotion and mass use
Although natural corrosion inhibitors are easy to biodegrade, non-toxic and pollution-free, but generally have low corrosion inhibition efficiency, large dosage, and relatively complex components, the corrosion inhibition mechanism needs to be further studied

Method used

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  • Green compound corrosion inhibitor for inhibiting corrosion of carbon steel in seawater
  • Green compound corrosion inhibitor for inhibiting corrosion of carbon steel in seawater

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Effect test

Embodiment 1

[0019] The green compound corrosion inhibitor for inhibiting the corrosion of carbon steel in seawater according to the invention includes PESA, HPMA, PASP, sodium citrate, sodium molybdate and sodium silicate.

[0020] The contents of PESA, HPMA, PASP, sodium citrate, sodium molybdate and sodium silicate are 30mg / L, 6mg / L, 50mg / L, 50mg / L, 10mg / L and 10mg / L respectively.

Embodiment 2

[0022] The green compound corrosion inhibitor for inhibiting the corrosion of carbon steel in seawater according to the invention includes PESA, HPMA, PASP, sodium citrate, sodium molybdate and sodium silicate.

[0023] The contents of PESA, HPMA, PASP, sodium citrate, sodium molybdate and sodium silicate are 20mg / L, 6mg / L, 40mg / L, 40mg / L, 10mg / L and 10mg / L respectively.

Embodiment 3

[0025] The green compound corrosion inhibitor for inhibiting the corrosion of carbon steel in seawater according to the invention includes PESA, HPMA, PASP, sodium citrate, sodium molybdate and sodium silicate.

[0026] The contents of PESA, HPMA, PASP, sodium citrate, sodium molybdate and sodium silicate are 30mg / L, 8mg / L, 50mg / L, 50mg / L, 15mg / L and 15mg / L respectively.

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Abstract

The invention discloses a green compound corrosion inhibitor for inhibiting corrosion of carbon steel in seawater. The green compound corrosion inhibitor comprises PESA, HPMA, PASP, sodium citrate, sodium molybdate and sodium silicate, and has high corrosion inhibition efficiency and low cost.

Description

technical field [0001] The invention belongs to the field of anti-corrosion of carbon steel in seawater medium, and relates to a green composite corrosion inhibitor for inhibiting the corrosion of carbon steel in seawater. Background technique [0002] With the increasing scarcity of fresh water resources, the fresh water crisis is more and more obvious in front of us, and the sea water resources are abundant, and the effective development and utilization of sea water can fundamentally solve the fresh water crisis. The direct use of seawater is mainly to replace fresh water with seawater for industrial and agricultural production, and the indirect use of seawater is mainly to develop and utilize chemical resources in seawater and extract useful substances in seawater. In developed areas, the use of seawater instead of freshwater is widely used in coastal electric power, metallurgy, chemical industry, petroleum and other industrial fields. Especially in Japan and Europe, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/08
CPCC23F11/08
Inventor 孙祥飞
Owner XIAN THERMAL POWER RES INST CO LTD
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