EXPERIMENTAL STUDY ON ASCORBIC ACID ADDITIVE AS GREEN INHIBITOR AGAINST CORROSION OF MILD STEEL

Abstract

Purpose of study: The corrosion behavior of mild steel and the inhibition effect of ascorbic acid (an anti-oxidant additive) on aluminum coatings on the mild steel have been studied by weight loss technique under different corrosive medium. Methodology: Tap water, 3% Na₂CO₃ solution, seawater and open-air were chosen as different corrosive medium at ambient temperature range of 35- 40⁰C. Corrosion was recorded using the weight-loss method and the rate was calculated. Later similar mid steel samples were coated with Sodium Bicarbonate paste, aluminum paint with ascorbic acid additive, and aluminum paint without ascorbic acid additive, in similar corroding medium, and the corrosion rate was calculated using the weight-loss method. Main Findings: Results show that the percentage of mild steel corrosion was found to be highest in the seawater and lowest in 3% Na₂CO₃ solution. Sodium Bicarbonate paste reduces the corrosion rate more studies on the corrosion protection was performed by coating the mild steel surface with aluminum paint along with ascorbic acid inhibitor i.e., a green corrosion inhibitor and it was found that the weight loss data is: 85.03 g from 85.05 g, 82.39 g from 82.43 g, no weight loss and 85.73 g from 85.74 g in tap water, seawater, 3% Na₂CO₃ solution and air medium respectively. Thus, the addition of ascorbic acid inhibitor gave the highest inhibition efficiency for aluminum paint.