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Phosphate-free copper alloy composite corrosion inhibitor for seawater circulating cooling water, and preparation and using methods of phosphate-free copper alloy composite corrosion inhibitor

A composite corrosion inhibitor and circulating cooling water technology, applied in chemical instruments and methods, complex/solubilizer treatment, water/sludge/sewage treatment, etc., can solve problems such as copper alloy corrosion

Active Publication Date: 2012-08-15
天津市中海水处理科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a phosphorus-free copper alloy composite corrosion inhibitor for seawater circulating cooling water and its preparation and use method, to solve the corrosion problem of copper alloy in seawater circulating cooling system, aiming at the current To meet the needs of the development of seawater circulating cooling technology and the protection of marine ecological environment, design and develop new copper alloy seawater corrosion inhibitors around the three goals of performance, environment and economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] According to the corrosion weight loss test, 50 mg / L of benzotriazole and 50 mg / L of mercaptobenzothiazole were added to seawater, and the aluminum brass test piece was subjected to pre-coating treatment (at room temperature 20°C, dynamic speed of hanging piece was 80r / L). min, continuous operation for 24h), then transfer to benzotriazole 2mg / L, mercaptobenzothiazole 6mg / L, zinc sulfate (Zn 2+ It operates in seawater of 2mg / L, and the measured corrosion rate is 0.00150mm / a.

Embodiment 2

[0034] According to the corrosion weight loss test, 50 mg / L of benzotriazole and 50 mg / L of mercaptobenzothiazole were added to the seawater, and the aluminum brass test piece was subjected to pre-film treatment (at room temperature 20°C, dynamic speed of hanging piece was 120r / L). min, continuous operation for 48h), and then transferred to benzotriazole 3mg / L, mercaptobenzothiazole 2mg / L, zinc chloride (Zn 2+ It operates in seawater of 4mg / L, and the measured corrosion rate is 0.00125mm / a.

Embodiment 3

[0036] According to the corrosion weight loss test, 50 mg / L of benzotriazole and 100 mg / L of mercaptobenzothiazole were added to the seawater, and the aluminum brass test piece was pre-coated (at room temperature 20°C, dynamic speed of hanging piece was 100r / L). min, continuous operation for 35h), and then transferred to seawater with benzotriazole 2mg / L, mercaptobenzothiazole 6mg / L, zinc gluconate 5mg / L, and the measured corrosion rate was 0.00146mm / a.

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Abstract

The invention discloses a phosphate-free copper alloy composite corrosion inhibitor for seawater circulating cooling water, and preparation and using methods of the phosphate-free copper alloy composite corrosion inhibitor. The phosphate-free copper alloy composite corrosion inhibitor consists of a prefilming agent and a normal-operation corrosion inhibitor, wherein the prefilming agent refers to an organic azole compound and the normal-operation corrosion inhibitor consists of an organic azole compound and inorganic salt. Aiming at the characteristics of a seawater circulating cooling technology and requirements on system economic operation, a technology for cooling seawater by firstly adopting the high-concentration organic azole polybasic prefilming agent for treatment and secondly adopting the low-concentration compounded normal-operation corrosion inhibitor for treatment is provided, and therefore, the purposes that the corrosion inhibitor rapidly forms films with high concentration and keeps the operation of film maintenance in low concentration are realized; and within concentration multiple 1.8-2.2, the corrosion rate of copper alloy is controlled to be less than 0.003mm / a. The phosphate-free copper alloy composite corrosion inhibitor product has extensive sources of materials, excellent solubility, high cost performance, low toxicity, environment-friendliness, no phosphate, no pollution to sea environment, and good compatibility with a seawater dirt dispersion agent and a bacteria-algae inhibitor.

Description

technical field [0001] The invention relates to the technical field of industrial circulating cooling water treatment, in particular to a phosphorus-free copper alloy composite corrosion inhibitor for seawater circulating cooling water and its preparation and use method. Background technique [0002] As an environmentally friendly water-saving technology, seawater circulating cooling has huge potential application demands in high water-consuming industries such as electric power, chemical industry, petrochemical, and steel. The development and utilization of seawater instead of fresh water as industrial circulating cooling water is an important way to alleviate my country's coastal cities and regions. One of the important ways to protect the marine ecological environment due to the shortage of fresh water resources. [0003] In today's increasingly scarce fresh water resources, the direct use of sea water has received widespread attention from all walks of life. More and mor...

Claims

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Application Information

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IPC IPC(8): C02F5/08C02F5/12
Inventor 王维珍侯纯扬武杰刘淑静高良富尹建华张正高丽丽王静高翔侯相钰崔振东
Owner 天津市中海水处理科技有限公司
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