Environmental protection and high efficiency corrosion inhibitor for inhibiting salt water corrosion on carbon steel, preparation method and use method thereof

A salt water corrosion and corrosion inhibitor technology, applied in the chemical field, can solve the problems of accelerated corrosion, insufficient passivation film coverage, low corrosion inhibition rate, etc.

Active Publication Date: 2014-01-15
CHAOYANG GUANGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are serious problems in the potassium dichromate type corrosion inhibitor: 1) Potassium dichromate belongs to the cationic oxidation type corrosion inhibitor, if the addition amount is insufficient, the coverage of the passivation film will be insufficient,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: by 10% benzotriazole, 3% sodium benzoate, 2% sodium molybdate, 5% triethanolamine, 1% disodium hydrogen phosphate, 1% sodium gluconate, 2% hydrazine and 2% hydroxide Sodium and the balance of deionized water are formulated into SMT-BAS5 environmental protection and high-efficiency corrosion inhibitor.

[0011] The test solution is 30% calcium chloride solution (a solution composed of analytically pure calcium chloride reagent and deionized water, pH=6.0). Take out 2 parts of 1.0L solution respectively, one of which is used as a blank solution without adding any corrosion inhibitor components; the other part is added with 0.3% SMT-BAS5 environmental protection and high-efficiency corrosion inhibitor. The test metal is 20# standard carbon steel test piece type I, the specification is 50mm×25mm×2mm, and the surface area is 28cm 2 . The test method is carried out according to "General Principles of Corrosion Experiments of Metals and Alloys GB T 19291-2006"....

Embodiment 2

[0013] Embodiment 2: The method and the formula of the corrosion inhibitor are the same as in Example 1, the concentration of the corrosion inhibitor is increased to 0.5%, and the corrosion rate to 20# carbon steel is measured to be 0.0028mm / a, and the corrosion inhibition rate is 96.06%.

Embodiment 3

[0014] Embodiment 3: by 10% benzotriazole, 3% sodium benzoate, 2% sodium molybdate, 5% triethanolamine, 1% disodium hydrogen phosphate, 1% sodium gluconate, 2% dimethyl ketoxime and SMT-BAS40 environment-friendly, high-efficiency and low-toxicity corrosion inhibitor is formulated with 2% sodium hydroxide and the balance of deionized water.

[0015] The corrosion medium is an industrial calcium chloride aqueous solution, which is composed of 30% general industrial calcium chloride and tap water, and the pH of the solution is 9.5. Two parts of 1.0L solution were taken out, one of which was used as a blank solution without adding any corrosion inhibitor components; the other part was added with 0.3% mass concentration of SMT-BAS40 environmentally friendly, high-efficiency and low-toxicity corrosion inhibitor. The test metal is 20# standard carbon steel test piece type I, the specification is 50mm×25mm×2mm, and the surface area is 28cm 2 . The test method is carried out accordin...

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Abstract

The present invention provides an environmental protection and high efficiency corrosion inhibitor for inhibiting salt water corrosion on carbon steel, a preparation method and a use method thereof, and relates to the field of chemistry. The corrosion inhibitor has characteristics of high efficiency, low cost, low toxicity and environmental protection, and is prepared through carrying out mixing stirring dissolving on 5-50% of a benzotriazole substance, 1-10% of benzoic acid and a salt thereof, 1-10% of molybdate, tungstate, phosphomolybdic acid and a salt thereof, and phosphotungstic acid and a salt thereof, 2-20% of an alcohol amine substance, 1-10% of an acid phosphate, 1-10% of a gluconate, 1-10% of an alkaline regulator, 1-10% of an oxygen scavenging agent and the balance of water. According to the present invention, the potassium dichromate or the sodium nitrite with high toxicity, and the non-environmental protection high phosphorus and high zinc can be replaced, and corrosion of calcium chloride salt water on carbon steel and copper can be significantly inhibited when the concentration of the corrosion inhibitor is 0.3-0.5%.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a novel high-efficiency environment-friendly corrosion inhibitor (SMT-BA) for inhibiting the corrosion of carbon steel in frozen brine (especially 30% calcium chloride solution) and its preparation method and use method. Background technique [0002] Calcium chloride brine has typical advantages such as low freezing point (the freezing point of 30% calcium chloride aqueous solution is lower than -50°C), low price, no flammability, high heat capacity, and good thermal conductivity. It has been used as frozen brine for nearly 200 years. Provide safe and reliable cold delivery for the process. However, calcium chloride brine is highly corrosive to steel. For example, it is uniformly corrosive to carbon steel, and the corrosion rate is generally 0.08mm / a. Generally, a large amount of corrosion leakage occurs in carbon steel pipelines that have been used for 2 to 3 years; and It is pitting a...

Claims

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Application Information

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IPC IPC(8): C02F5/14
Inventor 不公告发明人
Owner CHAOYANG GUANGDA CHEM
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