In recent years, in order to save fresh water resources and reduce the cost, some of the coastal chemical, metallurgy, electric power and petrochemical enterprises began to use seawater as a type of industrial circulating cooling water.
Although this practice has many advantages, in the sea cl- content is high, easy to produce metal corrosion, metal corrosion is one of the most important destructive factors, which can cause corrosion and perforation of equipment and pipes, cause serious corrosion, and cause enormous economic losses and social harm.
In order to reduce the probability of metal corrosion, it is a simple and effective anti-corrosion method to add inhibitors to circulating cooling water. Only common chromate, nitrite, phosphate and other corrosive agents are toxic preparations, excessive use is tantamount to quenching thirst with poison, research and development of low toxicity, non-toxic and effective corrosion inhibitors have a greater significance.
Sodium tungstate inhibitor is one of inorganic inhibitors. Because of its low toxicity, no harm to environment, human body and crops, and no microorganism breeding, it is also used as metal corrosion inhibitor, however, sodium tungstate is good, but the price is not approachable. Moreover, various industrial applications show that the single use of sodium tungstate inhibitors is not only of large amount, but also of limited effect. Therefore, more scholars have developed many kinds of sodium tungstate composite inhibitors based on sodium tungstate.
Some scholars combine sodium tungstate, twelve sodium benzene sulfonate and triethanolamine, three yuan compound release agent of sodium tungstate was prepared, and a comparative test of carbon steel was carried out in simulated seawater environment, the results show that the surface corrosion of carbon steel sheet without corrosion inhibitor is serious and uneven; The corrosion resistant carbon steel sheet with three yuan of sodium tungstate is intact, the surface is clear and there is no trace of corrosion, and the inhibition efficiency reaches 75%, it is also emphasized that the sodium tungstate three yuan corrosion inhibitor has the advantages of less dosage, low cost and high corrosion inhibition rate, and can meet the requirements of industrial universal use.
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