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Corrosion inhibitor

A corrosion inhibitor and weight percentage technology, applied in the chemical field, can solve problems such as high cost, pollute the environment, and large dosage of corrosion inhibitor, and achieve the effect of low toxicity, low phosphorus content, and enhanced corrosion inhibition effect

Inactive Publication Date: 2009-12-23
SHANGHAI WEILAI ENTERPRISE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of corrosion inhibitor, described this kind of corrosion inhibitor will solve the technical problems of large dose, high cost and environmental pollution of corrosion inhibitor in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] This example uses 20# carbon steel, red copper, stainless steel hanging piece (Type I, surface area 28CM 2 ) for corrosion testing.

[0014] Corrosion inhibitor ratio: sodium nitrite 22.7%, sodium borate 2%, HPAA 2%, TEA 2%, BTA 0.3%, acrylic acid sulfonic acid terpolymer 1.5%, NaOH 4%, H 2 O 65.5%.

[0015] Test water quality: PH6.8, conductivity 56us / cm, M-alkalinity (as CaCO 3 Total) 87mg / L, Ca 2+ (as CaCO 3 meter) 0.5mg / L, total hardness (as CaCO 3 Total) 0.8mg / L, Cl-7mg / L.

[0016] Referring to the GB18175-2000 standard, the above corrosion inhibitor and water quality were used to carry out the corrosion test of the rotating coupon. The test water temperature was 45°C, the speed was 75r / min, and the operation was 72h. The amount of corrosion inhibitor added was 400mg / L. The corrosion rate is 0.024mm / a, the corrosion rate of copper coupon is 0.0004mm / a, and the corrosion rate of stainless steel coupon is 0.0001mm / a.

Embodiment 2

[0018] This embodiment is applied in a closed system of softened water in steelmaking, through 20# carbon steel, brass hanging piece (II type, surface area 20CM 2 ) for daily effect monitoring.

[0019] Proportion of corrosion inhibitor: sodium nitrite 22%, sodium borate 2%, HPAA 3%, TEA 2%, BTA 0.3%, acrylic acid sulfonic acid terpolymer 2%, NaOH 4%, H 2 O 64.7%.

[0020] System parameters:

[0021]

[0022] Supplementary water quality:

[0023]

[0024] Add 400mg / L of corrosion inhibitor to the system under the above working conditions and water quality conditions, and hang 20# carbon steel and brass hangers in the hanger boxes set up in the four subsystems (B1, B2, B3, B4) respectively. From September to November 2006, the on-site monitoring coupons were treated monthly according to the coupon treatment method in the GB18175-2000 standard. The corrosion rate is as follows:

[0025]

[0026]

[0027] According to the monitoring data, the corrosion inhibition ...

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Abstract

The invention discloses a corrosion inhibitor, which is prepared from sodium nitrite, borate, organic phosphonate compounds, organic amine, aromatic azole compounds, AA / AMPS terpolymer, solid alkali and water. The corrosion inhibitor improves the corrosion inhibition effect by compounding the sodium nitrite and other substances and by means of the synergy of the compositions; and the dosage of nitrite (calculated by NO2) is reduced to between 50 and 60 mg / L from between 400 and 500 mg / L so as to greatly reduce the dosage of the toxic sodium nitrite and reduce influence on environment and processing cost. Due to good synergy, the corrosion inhibitor has better corrosion inhibition performance.

Description

Technical field: [0001] The invention relates to the field of chemistry, in particular to water treatment technology, in particular to a cooling water treatment agent for a closed system, in particular to a corrosion inhibitor. Background technique: [0002] The use of chemical corrosion inhibitors to inhibit the corrosion of steel in water is not only effective, but also relatively simple. At present, the corrosion inhibitors used in the closed cooling water systems of blast furnaces and electric furnaces in steel plants are nitrite-based and molybdate-based, and these two types of corrosion inhibitors have their own advantages and disadvantages. Although molybdate-based corrosion inhibitors have high corrosion inhibition rate, low toxicity and no pollution, but the dosage is large, the price is high, and the cost is high, which makes it difficult to popularize and apply. Conventional nitrite-based corrosion inhibitors that are widely used have the advantages of high corro...

Claims

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Application Information

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IPC IPC(8): C02F5/14
Inventor 刘昕诸育德周国平
Owner SHANGHAI WEILAI ENTERPRISE
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