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Environment-friendly medium-temperature phosphating solution for oilfield pipeline coupling

An environmentally friendly, phosphating liquid technology, applied in the direction of metal material coating process, etc., can solve the problems of operator health hazards, unpleasant smell, complicated operation procedures, etc., to reduce quality and safety hazards, reduce manganese salt consumption, Good abrasion resistance

Inactive Publication Date: 2013-07-17
刘新智
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, scientists have proved through a large number of experiments that even a small amount of manganese salt solution, such as a manganese salt solution with a concentration of about 1 / 100,000, can cause damage to crops such as pods, tomatoes, soybeans, and flax. When exposed to manganese salts, manganese can enter the body through the lungs, digestive tract and skin, causing serious lesions in the central nervous system, causing serious damage to the striatum pallidus of the brain, and causing degenerative changes in the liver, kidney and myocardium
At present, the manganese-based phosphating solution used by the coupling manufacturer for the pipe coupling is a liquid for high-temperature phosphating reaction, and its temperature must be 90°C to 100°C. about 20 minutes) to lift a large number of workpieces out of the transfer tank, which will cause splashes of manganese salts and spread them in the operating environment, which is impossible without causing harm to the health of the operators
Therefore, the currently known high-temperature manganese-based phosphating solution does not meet the requirements of the petrochemical field "reducing pollution, saving energy, high quality, non-toxic and environmentally friendly, and must not endanger human health and destroy the ecological environment during and after use..." development trend
In addition, the existing technology also has problems such as complicated operating procedures and difficulty in mastering the amount of new liquid added.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 240g of water, add 33g of phosphoric acid, 150g of zinc dihydrogen, calcium nitrate, 170g of manganese compound salt, and a small amount of citric acid.

[0019] Dilute the main solution of the above-mentioned medium-temperature phosphating solution with water to form a working solution, the dilution ratio is: main solution of phosphating solution: water = 1:7, then heat it to 70°C, and put the cleaned workpiece sleeve or socket Soak the hoop in the working fluid, take it out after 15 minutes of reaction, wash it with hot and cold water, and seal it with emulsified oil saponification. The resulting product has strong anti-corrosion and anti-rust capabilities.

Embodiment 2

[0021] Take 201g of water, add 140g of industrial phosphoric acid and 41.5g of zinc oxide and stir until all the zinc oxide is dissolved, then add 220g of zinc-manganese nitrate compound, and filter to obtain 602.5g of zinc-manganese-based medium-temperature phosphating solution main liquid agent zinc-manganese Department of phosphating solution.

[0022] Add ten times the amount of water to the main solution of the phosphating solution, and then heat it to 75°C. Soak the cleaned coupling (J55) in it, take it out after 15 minutes, and then wash with water and saponify successively to obtain a black-gray phosphating film.

Embodiment 3

[0024] Take 240kg of water, 33kg of phosphoric acid, 151kg of zinc dihydrogen, and 173kg of calcium and manganese nitrate, fully dissolve and filter, and obtain 597kg of the main solution of the medium-temperature phosphating solution for couplings.

[0025] Send the main solution of the above medium-temperature phosphating solution for the coupling to the coupling manufacturer, prepare 180kg of the main solution of the phosphating solution for the 2000L phosphating tank at the user, add water to 1700kg, then heat it to 75°C, and use it Produced in coupling phosphating industry. Phosphate for 15 minutes, take out the coupling, wash with hot water, cold water twice and seal with saponified oil. The surface of the obtained product has a layer of black phosphating film with a film thickness of 20-25 microns. After NaCL immersion test, it will not return after more than 24 hours. rust, its sealing performance and the number of times of tripping all meet the user's requirements.

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PUM

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Abstract

The invention relates to an environment-friendly medium-temperature phosphating solution for oilfield pipeline coupling, which is a medium-temperature phosphating working solution obtained by diluting and mixing a main liquid agent with water in the proportion of 1:6-11 and heating to the temperature of 65-75 DEG C, wherein the main liquid agent comprises phosphoric acid, phosphate, nitrate, an auxiliary agent and water. Because a medium-temperature phosphating technology is adopted in the invention, not only the characteristics of keeping good lubricating property and wear resistance of a product and preventing occlusion, scuffing and the like of a traditional high-temperature phosphating solution are kept, but also the consumption of manganese salt is greatly decreased, the man-made quality and hidden danger of operators is reduced, and meanwhile, operation procedures are also simplified. The product has the advantages of scientific formula, low cost, convenient preparation, good lubricating and wear resisting performance and environmental protection performance and the like.

Description

technical field [0001] The invention belongs to the technical field of petrochemical coating preparation products, and relates to an environment-friendly medium-temperature phosphating solution for oilfield pipeline couplings. Background technique [0002] At present, a large number of manganese-based coupling phosphating fluids based on Malv salt are used in oilfield pipeline couplings. The advantages of this phosphating fluid have long been recognized: good heat resistance and wear resistance, and the film layer can reduce friction. Coefficient, can prevent seizure and abrasion, improve lubrication and reduce wear, and it is based on the above advantages that it becomes the first choice for phosphating coating for couplings. However, in recent years, scientists have proved through a large number of experiments that even a small amount of manganese salt solution, such as a manganese salt solution with a concentration of about 1 / 100,000, can cause damage to crops such as pod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/08C23C22/17
Inventor 刘新智
Owner 刘新智