Effect of H_2S on Inhibition Behavior of Thiourea in Dilute H_2SO_4 Solution

The corrosion behavior of stainless steel in dilute H\-2SO\-4 containing thiourea was investigated with weight loss and electrochemical dynamic potential reactivation (EPR) technology. The effects of temperature and acidity were also studied. The results showed that the inhibition efficiency was greatly affected by H\-2S. The inhibition efficiency of thiourea decreased with the raise of temperature, which was probably related to H\-2S produced by hydrolysis of thiourea.