Effect of heat stable acids on corrosion and stress corrosion cracking initiation of 304 and 316 stainless steels in activated methyl diethanol amine (aMDEA) solution

Abstract

This study investigates the effect of formic, acetic and oxalic acids as Heat Stable Acids at different concentrations in Activated Methyl Diethanol Amine (aMDEA) solution on corrosion and stress corrosion cracking (SCC) initiation of 304 and 316 austenitic stainless steels. In this regard, cyclic polarisation and U-bend tests were performed. Results showed that the presence of formic, acetic and oxalic acids as Heat Stable Acids in aMDEA solution at different concentrations facilitated local corrosion and crack initiation on 304 and 316 stainless steels. Corrosion rate and crack initiation susceptibility increased with increase in heat stable acid concentration. Also, it was observed that 304 stainless steel was more susceptible to crack initiation than 316 stainless steel in aMDEA solution in investigated environments. This is believed to be due to the less resistive passive layer formed on 304 stainless steel in investigated environments.

Study on the Effects of Stress Corrosion Cracking (Scc) in Austenitic Stainless Steels – A Review

“…H. Panahi* et al, [7] explained that examination that explores the impact of formic, acidic and oxalic acids as Heat Stable Acids at various focuses in Activated Methyl Diethanol Amine (aMDEA) arrangement on consumption and stress consumption splitting (SCC) inception of 304 and 316 austenitic tempered steels. In such manner, cyclic polarization and U-twist tests were performed.…”

Corrosion performance of carbon steel and 304 stainless steel in activated methyldiethanolamine solution using autoclave tests

“…[1][2][3][4] MDEA, as a third type of amine, has the advantages of lower cost, larger absorption capacity, lower degradation tendency and lower energy consumption of regeneration in comparison with firstor second-type amines. 5 However, MDEA is known for its slow kinetics of the CO 2 absorption process. 6 In recent years, mixtures of alkanolamines or in combination with some activators have attracted interest to overcome this drawback.…”

“…there are few reports evaluating the corrosion performance of CS and stainless steels in aMDEA solution. 5,19,20 However, most of the reported papers employed short-term electrochemical analysis or long-term immersion corrosion testing in ambient or low temperature/pressure conditions, while the corrosion mechanism can be different in operating conditions (i.e. high temperature and pressure).…”