Corrosion Inhibition of Honeycomb Waste Extracts for 304 Stainless Steel in Sulfuric Acid Solution.

Femiana Gapsari,Kartika A Madurani,Hastono Wijaya,Fredy Kurniawan,Firman Mangasa Simanjuntak,Andoko Andoko

doi:10.3390/ma12132120

Abstract

The extract of honeycomb waste was studied as a corrosion inhibitor on 304 stainless steel in H2SO4 solutions. The honeycomb waste was obtained from beekeeping at Lawang-Malang, East Java, Indonesia. Electrochemical and scanning electron microscopy methods were used to investigate the performance of the corrosion inhibition process. The inhibition efficiency of the inhibitor (2000 mg/L) reached 97.29% in 0.5 M H2SO4 and decreased with the acid concentration. Kinetic parameters were calculated to explain the effect of acid concentration on the inhibition process. The study on the adsorption behavior of the extracts followed the Frumkin isotherm model. The adsorption of the inhibitor on the 304 stainless steel surface was confirmed by the negative and lower values of Gibbs free energy. The obtained scanning electron microscopy (SEM) images were confirmed by comparing the surface of the specimens with and without inhibitor after corroding for one week. The results indicated that the extract acted as a good inhibitor for 304 stainless steel in acid corrosion.

Highlights

Honey industries generally extract honey by squeezing the honeycomb; at this point, the squeezed honeycomb is damaged and becomes an organic waste that has no market value
We investigated the performance of the honeycomb waste extract as a corrosion inhibitor in various concentrations of
The experiments were conducted on 304 SS (0.04% C, 0.52 % Si, 0.92% Mn, 0.030% P, 0.002% S, 9.58% Ni, 18.15% Cr and the balance Fe, in wt.)

Summary

Introduction

Honey industries generally extract honey by squeezing the honeycomb; at this point, the squeezed honeycomb is damaged and becomes an organic waste that has no market value. This honeycomb waste contains bees wax and honey sugars (i.e., fructose, glucose and sucrose). It has a refractive index of 1.4398–1.4451 at 75 ◦ C, a melting point of 61–65 ◦ C, an acid number of 17–22, an ester number of 70–90, and a saponication number of 87–102. In this work, we evaluated the potential of honeycomb waste as a corrosion inhibitor for structural steel materials

Methods

Results

Conclusion