Effect of Different Corrosion Inhibitors on Corrosion of AM60B Magnesium Alloy in Simulated Vehicle Coolant

Sodium alginate, sodium silicate and sodium dodecyl benzene sulfonate were selected as the corrosion inhibitors, and the corrosion resistance of AM60B magnesium alloy in simulated vehicle coolant containing different corrosion inhibitors was investigated. The results show that using sodium alginate, sodium silicate or sodium dodecyl benzene sulfonate as corrosion inhibitor can inhibit the corrosion of AM60B magnesium alloy in simulated vehicle coolant to reduce corrosion rate. When sodium silicate is used as corrosion inhibitor, the corrosion current density of AM60B magnesium alloy decreases extremely compared with that without corrosion inhibitor, and the charge transfer resistance increases by nearly two times. The corrosion rate of AM60B magnesium alloy is the lowest when immersed in simulated vehicle coolant containing sodium silicate. Moreover, the corrosion inhibition efficiency of sodium silicate for AM60B magnesium alloy reaches 96%, which is better than sodium alginate and sodium dodecyl benzene sulfonate. Sodium silicate is considered as an ideal corrosion inhibitor which can effectively inhibit the corrosion of AM60B magnesium alloy in simulated vehicle coolant.