Heat Treatment Effect on Carbon Steel Corrosion Resistance at Different Carbon Content

The heat treatment effect on different carbon content of carbon steel has been investigated. Five samples with different carbon content (0.08,0.15,0.2,0.3,0.4%) were considered to establish corrosion characteristics. The corrosive media consists of 50 gm salt for each 100mL water and was prepared and analyzed chemically and physically. To perform the corrosion test, the samples were immersed in the corrosive media for 30 min. Then the corrosion effect was investigated by exploring the results of the corrosion effect using Mlab200 potentiostate based on tafel principals of polarization. It was seen that as the carbon content was increased, the corrosion durability of the carbon steel was decreased. Similar replications of the samples were exposed to annealing heat treatment by heating to 850℃ for 17min and then let to be cooled in an isolated furnace. The test results have shown degrading of samples corrosion resistance after the heat treatment. Corroded samples exhibited increasing in the surface area roughness indicating corrosion defects.