Efficiency of Conventional Method of Protection Against Corrosion in ASTM A36 Steels in Saline Medium

Abstract

Abstract This study aims to compare the performance of three anti-corrosion protection methods and estimate the corrosion rate according to the ASTM G1-03 standard in ASTM A36 steel plates. The applied methodology follows the procedure established in the ASTM G31-21 and ASTM G1-03 standards. While a chemical solution based on the ASTM G44 standards was used for corrosion. The corrosion rate was carried out by calculating the optimal sample size of the number of steel witness plates A36 to be immersed in a 3.5% sodium chloride solution, placed in 4 polypropylene vats, simulating the corrosive environment under conditions containing a pH between 6-7 and a temperature between 25-30ºC. For the first method, a polymeric coating was applied according to the SSPC-PA 1 standard using high-volume solids epoxy paints with a corrosion rate of 0.0502 mm/year. In the second method, cathodic protection was applied by sacrificial anode on the witness plates obtaining a speed of 0.0275 mm/year. The third method used a sacrificial anode by an impressed current in which an external source was used to circulate current between the anode and cathode, resulting in 0.0096 mm/year.

Keywords

• corrosion, surface protection, corrosion rate, astm a36 steel, sacrificial anode.