Corrosion Inhibition of Edta for 304 l Steel in 1m HCL

In process industries Hydrochloric acid is stored and transported in 304 L tanks and pipes at room temperatures. These tanks and pipes undergo severe corrosion overtime causing heavy losses to the industries. Developing effective methods to mitigate corrosion and extend the lifespan of materials is a pressing concern. This study investigates the corrosion inhibition mechanism of Ethylenediaminetetraacetic acid (EDTA) on austenitic stainless steel 304L in hydrochloric acid (HCl) solution. The corrosion rate of SS 304L was quantitatively determined to be 45.6 mils per year (mpy) using the gravimetric method. The experiments were repeated by adding three different concentrations of EDTA to the HCl solution viz 0.2gm, 0.4gm and 0.6gm. The corrosion rate was 7.49,5.43 and 5.68 mpy and the inhibition efficiency was 83.56%, 88.08%, and 87.54%with EDTA concentrations 0.2gm, 0.4gm and 0.6gm respectively. The results indicate addition of 0.4gm EDTA in HCL solution increases the inhibition efficiency and reduces rate of corrosion.