Green corrosion inhibitor for inhibiting carbon steel from corrosion in seawater medium and preparation method and application of green corrosion inhibitor

Abstract

The invention discloses a green corrosion inhibitor for inhibiting carbon steel from corrosion in a seawater medium and a preparation method and application of the green corrosion inhibitor and belongs to the field of corrosion protection of carbon steel. The green corrosion inhibitor consists of 5-15 parts of calcium gluconate, 5-15 parts of polyaspartic acid, 5-20 parts of sodium tungstate, 20-40 parts of sodium gluconate, 5-13 parts of dodecyl polyglucoside, 0.5-0.8 part of isopropyl palmitate and 25-35 parts of water. The preparation method comprises the following steps: (a) dissolving calcium gluconate in water in proportion, and performing stirring for dissolution; (b) adding sodium tungstate into the obtained solution in proportion, and performing stirring for dissolution; (c) sequentially adding sodium gluconate, polyaspartic acid and dodecyl polyglucoside in proportion, and stirring for dissolution; and (d) adding isopropyl palmitate in proportion, and performing stirring for 10-15 min. The green corrosion inhibitor has the advantages of being simple in preparation technology, mild in preparation condition and easy to prepare.

Description

technical field [0001] The invention belongs to the field of carbon steel anticorrosion, and more specifically relates to a green corrosion inhibitor for inhibiting the corrosion of carbon steel in seawater medium and 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 utilizat...

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Problems solved by technology

However, the corrosion inhibitor has the problem of high toxicity due to the use of formaldehyde; in addition, the formula is complex, the amount of use is large, and the thermal stability is poor.

[0008] Sun Liming et al. (Sun Liming, Wei Yutang, Zhao Ying, Zheng Erli, Research on Carbon Steel Corrosion Inhibitors in Green Salt Water Medium, Material Protection, Volume 39 (Supplement), 2006, 112-114) studied a corrosion inhibitor with good corrosion inhibition performance and low corrosion resistance. Toxic green salt water medium carbon steel corrosion inhibitor, the corrosion inhibitor is composed of calcium gluconate, polyaspartic acid, sodium molybdate, zinc sulfate, lauryl glucoside in a weight ratio of 1:1:1:3: 1 composition, the corrosion inhibition rate of this corrosion inhibitor to carbon steel in 22% brine medium (50°C) can reach more than 97%, but this corrosion inhibitor has the problem of using sodium molybdate, and the amount of corrosion inhibitor is relatively large

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