Corrosion-Inhibition of Copper in 3% NaCl Solution by Complex Inhibitors of Polyaspartic Acid and Sodium Tungstate

AC impedance method and polarization curve method were used to study the inhibition effects of environmental friendly inhibitors polyaspartic acid (PASP) and Na2WO4 , alone or in combination, for copper in 3% NaCl solution. The results indicated that both PASP and Na2WO4 were able to inhibit the corrosion of the copper in the 3% NaCl solution. PASP at a concentration of 40 mg/L showed the best inhibition effect for copper, while Na2WO4 gave the optimal inhibition action to copper at a concentration of 350 mg/L. When PASP and Na2 WO4 were formulated as a combined inhibitor, it showed good inhibition effect to copper at a total inhibitor concentration of 40 mg/L, and in this case PASP and Na2 WO4 showed synergistic inhibition effect, with the optimum ratio of PASP to Na2 WO4 to be 1:5. When the total inhibitor concentration of the combined inhibitor rose to 350 mg/L and PASP was mixed with Na2 WO4 at ratios of 7:1, 5:1, 3:1, 1:5, and 1:7, the combined inhibitor still showed good synergistic inhibition effect for copper in the saline water, and the optimum ratio of PASP to Na2 WO4 in this case was 7:1.

 

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