Compound corrosion inhibitor applied to low-carbon steel and preparation method of compound corrosion inhibitor

Abstract

The invention discloses a compound corrosion inhibitor applied to low-carbon steel and a preparation method of the compound corrosion inhibitor. According to the corrosion inhibitor, sodium molybdate,sodium silicate and deionized water are mixed according to a certain proportion and stirred until sodium molybdate, sodium silicate are completely dissolved; a certain amount of morpholine is slowlyadded into the mixed solution, constant stirring is carried out, and after the solution is cooled to room temperature, sodium carboxymethylcellulose (NaCMC) is added into the mixed solution accordingto a certain proportion; and under the condition of controlling the temperature, high-speed stirring, uniform mixing and dissolving are carried out. The corrosion inhibitor prepared through the methodhas an unexceptionable corrosion inhibiting effect on Q235 steel in a neutral medium. It is found through studies that the corrosion inhibitor can form a thin film on the surface of a base body, andcorrosion of a corrosive medium on metal is stopped. The experimental result shows that the corrosion inhibitor has an excellent corrosion preventing effect, and the corrosion inhibiting rate can reach 98.6%. The compound corrosion inhibitor is simple in preparation process and low in cost, and compared with a traditional chromate and phosphate corrosion inhibitor, the compound corrosion inhibitoris more environment-friendly.

Description

technical field [0001] The invention relates to the field of metal corrosion and protection, in particular to a composite corrosion inhibitor for carbon steel and a preparation method thereof. Background technique [0002] In today's era of continuous growth in engineering demand, steel has become an indispensable metal material in various industries such as aerospace, automotive, machine building, and shipbuilding. However, due to the corrosion of metallic materials, the world suffers huge economic losses every year. According to reports, the direct economic loss caused by metal corrosion in the world is about 700 billion U.S. dollars every year, and the loss caused by metal corrosion in my country accounts for about 4% of the gross national product (GNP). Therefore, it is very important to conduct anti-corrosion research on metals. engineering significance. [0003] Corrosion inhibitors, as a commonly used anti-corrosion measure, have been widely used in many industries. ...

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Problems solved by technology

However, environmental protection laws in many countries impose strict restrictions on the use of hexavalent chromium due to its toxicity and potential carcinogenic properties

In addition, improper treatment of phosphate waste liquid can easily cause eutrophication of water resources

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