Electrochemical study of two microalloyed pipeline steels in HS environments

Hydrogen Sulfide Corrosion of Weld Regions in API X52 Steel

“…In most of the cases, H 2 S presence increases the CR but, at low concentrations and prolonged immersion times, H 2 S has an inhibition eff ect due to the formation of a ferrous sulfi de (FeS) protective fi lm (Ma et al, 2000). Other studies (Fragiel et al, 2005;Pound et al, 1989;Brown et al, 2003;Genescá and Arzola, 2003), have considered the electrochemical H 2 S corrosion of carbon steel and the susceptibility of welds to SSC (Kobayashi et al, 1986;Zhao et al, 2003;Radkevych, 1999) but, to our knowledge, no corrosion analysis of the weld regions has been performed on X52 steel in sour environment for electrochemical corrosion. The aim of this work is to determine the specifi c response of each weld region to H 2 S corrosion.…”

Corrosion behaviour of X52 pipeline steel in high H2S concentration solutions at temperatures ranging from 25°C to 140°C

“…It is commonly acknowledged that the specific corrosion process determines the corrosion rate of a material under a certain environment. In the H 2 S corrosion of X52, the pipeline steel's temperature can affect the corrosion process from two opposite aspects: on the one hand it accelerates the electrochemical reaction of the iron with H 2 S and the diffusion process of the reaction species through the corrosion film to reach the reaction sites, these effects increase the corrosion rate and has already been discussed elsewhere by other researchers 22 – 24. On the other hand it affects the formation of different types of iron sulphides which show an important effect on the corrosion rate,25 – 27 because the corrosion products is able to slow down the corrosion process, which will be discussed in detail in the following part.…”

“…[22][23][24] On the other hand it affects the formation of different types of iron sulphides which show an important effect on the corrosion rate, 25-27 because the corrosion products is able to slow down the corrosion process, which will be discussed in detail in the following part.…”

“…hand it accelerates the electrochemical reaction of the iron with H 2 S and the diffusion process of the reaction species through the corrosion film to reach the reaction sites, these effects increase the corrosion rate and has already been discussed elsewhere by other researchers. [22][23][24] On the other hand it affects the formation of different types of iron sulphides which show an important effect on the corrosion rate, [25][26][27] because the corrosion products is able to slow down the corrosion process, which will be discussed in detail in the following part.…”

Comprehending the role of the S-phase on the corrosion behavior of austenitic stainless steel exposed to H2S/CO2-saturated liquid and vapor environments

“…Therefore, some studies related to biomass for CO2 mitigation are underway [6,7]. The corrosion behavior of metals in the H2S-H2O system is mainly affected by the depolarization of H+, HS−, S2− and H2S molecules [8,9]. There are a competition and synergy mechanism between H2S corrosion and CO2 corrosion.…”