ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Study the corrosion issues on galvanized steel induced in water tanks

Ghalia A. Gaber, Lamiaa Z. Mohamed, and Aliaa Abdelfatah

Department of Chemistry, Faculty of Science (Girls), Al-Azhar University, Nasr City, Cairo, Egypt

E-mail: lamiaa.zaky@cu.edu.eg

Received: 2 July 2023  Accepted: 17 August 2023

Abstract:

Weight loss, potentiodynamic polarization, and cyclic voltammetry tests were employed to assess the effects of sodium hypochlorite concentration and pH on the corrosion characteristics of galvanized steel in water tanks. Pitting corrosion appeared on the galvanized steel concurrently in neutral drinkable water. Passivation developed after exposure to 70 mg/L sodium hypochlorite solutions. The results demonstrated that adding NaClO to wastewater solutions reduced the corrosion rate. The corrosion rate of wastewater is 568.7 m/y, which can be reduced by adding NaClO to a lower value of 22.94 m/y at 70 mg/L. NaClO has the maximum efficiency at 70 mg/L, with a value of 95.96%. It was discovered that the galvanized steel in potable water was sensitive to passivation dissolution when hypochlorite solutions with concentrations ranging from 30 to 70 mg/L were added. However, hypochlorite solutions with concentrations greater than 150 mg/L cause significant corrosion on galvanized steel. The PDP and cyclic voltammetry findings revealed that the galvanized steel had good passivation properties under high 70 mg/L sodium hypochlorite concentrations. Only the sodium hypochlorite decreased the amounts of all sessile microorganism families. The scanning electron microscope was employed to check the corroded samples' morphology. Pitting corrosion was discovered alongside galvanic corrosion and uniform corrosion.Kindly check and confirm whether the corresponding author mail ID is correctly identified.Confirmed

Keywords: Corrosion; Corrosion measurements; Galvanized steel; Environmental impact; Biocide hypochlorite

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-03043-4

Chemical Papers 77 (12) 7539–7549 (2023)