Corrosion inhibitor capable of inhibiting carbon steel from corroding in salt water (sea) medium, preparation method and application thereof

Abstract

The invention discloses a corrosion inhibitor capable of inhibiting carbon steel from corroding in salt water (sea) medium, a preparation method and application thereof, and belongs to the technical field of corrosion inhibition of carbon steel. The corrosion inhibitor comprises 20-40 parts of zinc sulfate, 5-15 parts of calcium gluconate, 5-15 parts of sodium tungstate, 3-10 parts of sodium silicate, 1-3 parts of thiourea, 1-5 parts of ethanolamine phosphate, 0.3-0.8 parts of dodecyl polyglucoside, 0.5-1 part of hexadecanoic acid isopropyl ester, and 30-45 parts of water. The preparation method comprises the following steps: (a) dissolving the calcium gluconate in water according to the proportion, stirring and dissolving; (b) adding the sodium tungstate into the solution obtained by the step (a), stirring and dissolving; (c) sequentially adding zinc sulfate, thiourea, ethanolamine phosphate and dodecyl polyglucoside into the solution obtained by the step (b) according to the proportion, stirring and dissolving, and adding calcium silicate and stirring; (d) adding hexadecanoic acid isopropyl ester according to the proportion and stirring for 10-15 min. The corrosion inhibitor has advantages of high corrosion inhibition efficiency, small dosage, low cost, convenient use, and environmentally friendly type.

Description

technical field [0001] The invention belongs to the field of carbon steel anticorrosion, and more specifically relates to a corrosion inhibitor for inhibiting the corrosion of carbon steel in salt water (sea water) medium, its preparation method and application. Background technique [0002] At present, in the refrigeration industry, industrial calcium chloride and sodium chloride aqueous solutions are still widely used in various types of refrigerators and equipment and occasions that need to lower the freezing point due to their low freezing point and low price. However, due to the certain corrosiveness of industrial calcium chloride and sodium chloride aqueous solutions, when used as anti-freezing agents, anti-corrosion issues should be considered to ensure the service life of the equipment. In addition, since human beings are facing a crisis of serious shortage of fresh water resources, it is imperative to vigorously develop and utilize seawater. The development and uti...

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Problems solved by technology

However, formaldehyde is used in the corrosion inhibitor formula, which has the problem of high toxicity; in addition, the formula is complex and the amount used is large; the corrosion inhibitor has poor thermal stability

[0008] Sun Liming et al. (Sun Liming, Wei Yutang, Zhang Xuerong, Research on Carbon Steel Corrosion Inhibitors in Salt Water Medium, Hebei Chemical Industry, No. 6, 2004, 57-58) studied a cost-effective carbon steel corrosion inhibitor in salt water medium. The corrosion agent is composed of zinc sulfate, calcium gluconate, molybdate, thiourea, alcoholamine phosphate and sodium dodecylbenzenesulfonate in a weight ratio of 3.0:1.0:0.5:0.2:0.2:0.05. The corrosion inhibitor In 22.5% brine medium (50°C), the corrosion inhibition rate of carbon steel can reach more than 98%, but the corrosion inhibitor has the problem of using sodium molybdate, and the amount of corrosion inhibitor is relatively large

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