Sodium Tungstate Compound Corrosion Inhibitor Copper Protection
Sodium tungstate is an inorganic inhibitor. It has many advantages, such as low toxicity, no harm to environment, human body and crops, and no microorganism breeding.
However, sodium tungstate has its unavoidable defects. First of all, the effect of single sodium tungstate is limited, and it needs to be used to enhance the effect, at the same time, sodium tungstate is more expensive and impractical to use. Therefore, more enterprises are using sodium tungstate and cheaper chemicals to make sodium tungstate composite corrosion inhibitor to realize the function of protecting metal.
Polyaspartic acid (PASP) is a newly found environmental friendly water treatment agent. It has excellent scale inhibition, dispersion and good biodegradability, after polyaspartic acid used efficiently, stably microorganisms, fungi degradation of the final product harmless to the environment, is a very desirable water treating agent.
What is the effect of combining sodium tungstate with polyaspartic acid? Some scholars have combined these two methods to study the corrosion inhibition of copper in simulated seawater environment. In marine environment, when the total concentration of inhibitor of 7mg/L, PASP and Na2WO4 complex for copper have inhibition effect, but the effect is weak, however, synergistic effect between sodium tungstate and polyaspartic acid resulted in a good effect on corrosion inhibition, this is because of the weak oxidation of sodium tungstate react with copper, but the film formed by sodium tungstate has defects and pores, the polyaspartic acid, which is just salt with two valence copper ion or cuprous ion in the solution, plays a role in filling pores and repairing defects.
The research shows that the compound inhibitor of sodium tungstate and polyaspartic acid has good corrosion protection effect on copper. It not only improves the efficiency, but also reduces the cost, and has a very broad prospects for promotion.
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