Corrosion Inhibition of Methionine and Proline to 304 Stainless Steel

The corrosion inhibition of methionine and proline to 304 stainless steel in phase change materials (PCMs) solution was studied by electrochemical testing and scanning electron microscopy (SEM) observation. The corrosion inhibition mechanism was further studied theoretically by quantum chemical calculation and molecular dynamics simulation. The results show that the inhibitors of methionine, proline and methionine/proline compound could protect 304 stainless steel from corrosion in PCMs solution. The methionine/proline compound inhibitor had the highest inhibition efficiency. All three corrosion inhibitors were mixed corrosion inhibitors. Both methionine and proline molecules, which had active sites and thus could adsorb on the surface of iron, could effectively inhibit metal corrosion in PCMs solution.