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Application method of compound tungstate corrosion inhibitor of sea water

An application method, tungstate technology, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve the problems of high corrosion inhibitor use cost, low production cost, and corrosion inhibition efficiency Low and other problems, to achieve the effect of low production cost, low cost and high corrosion inhibition efficiency

Inactive Publication Date: 2010-01-06
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of high usage cost, low corrosion inhibition efficiency and harmfulness to the environment of the existing corrosion inhibitors, the present invention provides a corrosion inhibitor which has good solubility in seawater, is non-toxic and harmless to the environment, is biodegradable, and has high corrosion inhibition efficiency. Low production cost, application method of tungstate-based composite seawater corrosion inhibitor with tungstate as main component

Method used

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  • Application method of compound tungstate corrosion inhibitor of sea water
  • Application method of compound tungstate corrosion inhibitor of sea water
  • Application method of compound tungstate corrosion inhibitor of sea water

Examples

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Embodiment 1

[0012] Embodiment 1: In 1 liter of seawater, according to the mass concentration ratio, respectively take tungstate 40mg / L, polyepoxysuccinic acid 40mg / L, sodium gluconate 40mg / L and Zn 2+ (Zinc salt) 4mg / L is sequentially added to the circulating and cooled seawater, at a temperature of 30°C and within the range of adjusting the pH value to 6.5, it will have good corrosion inhibition.

[0013] Application Method Example 2: Based on 1 liter of seawater, 40 mg / L of tungstate, 40 mg / L of polyepoxysuccinic acid, 40 mg / L of sodium gluconate and Zn 2+ (Zinc salt) 4mg / L is sequentially added to the circulating and cooled seawater, and the temperature is 50°C, and the pH value is adjusted within the range of 8.0, it will play a very good corrosion inhibition.

[0014] Application Method Example 3: Based on 1 liter of seawater, tungstate 40mg / L, polyepoxysuccinic acid 40mg / L, sodium gluconate 40mg / L and Zn 2+ (Zinc salt) 4mg / L is sequentially added to the circulating and cooled seawa...

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Abstract

The invention relates to an application method of a compound tungstate corrosion inhibitor of sea water by using the sea water as circulating cooling water, which contains raw materials of tungstate, polyepoxysuccinic acid, sodium gluconate and zinc salts. The application method comprises the following steps: metered by 1L of the sea water, respectively adding 40mg / L of the tungstate, 40mg / L of the polyepoxysuccinic acid, 10mg / L of the sodium gluconate and 4mg / L of the zinc salts to the circulating cooling sea water according to mass concentration; testing the corrosion reaching a standard requirement of the annual corrosion rate of carbon steel specified in China under the conditions that the temperature is 30-60 DEG C and the pH value is 6.5-9.0. The corrosion inhibitor has good dissolubility, no poison and harm to environment, biodegradability, high corrosion inhibition efficiency and strong capacity of sustained action and is a green corrosion inhibitor having excellent development potential. The method for adding the corrosion inhibitor to the sea water is convenient and has low cost.

Description

technical field [0001] The invention relates to a seawater corrosion inhibitor and an application method, in particular to an application method of a tungstate compound seawater corrosion inhibitor used for seawater as circulating cooling water. Background technique [0002] Seawater circulation cooling technology research began in the 1970s. In foreign countries, after 30 years of development, seawater circulating cooling technology has entered the application stage, most of which are used in petrochemical and power systems. According to reports, in 2002, my country's seawater cooling water consumption was about 14 billion m3 / a, while Japan was about 300 billion m3 / a, and the United States was about 100 billion m3 / a. It can be seen that there is still a big gap between my country's seawater circulation cooling technology and foreign countries. The corrosion inhibitors used in seawater medium in the early days were mostly chromate, dichromate, sodium nitrite, inorganic pho...

Claims

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Application Information

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IPC IPC(8): C02F5/10
Inventor 柳鑫华王庆辉芮玉兰
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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