Study of the influence of the water pH the determination of corrosive-ness of petroleum derivative on carbon steel

Abstract:

Light petroleum derivates consist of nanpolar hydrocarbons, which are aggressive to carbon steel due to the presence of water. In this study, we show both experimentally and theoretically that the water-phase pH during corrosion is controlled by the interaction of the aqueous phase with the atmospheric CO2 and with iron corrosion products in both solution and precipitates. During the corrosion process, the pH of the solution changes, regardless of its initial value, towards a neutral value. This behaviour explains why the corrosiveness of a petroleum derivate emulsion is not influence by the initial water-phase pH.


Reference:
NAGAYASSU, Vanessa Yumi. PANOSSIAN, Zehbour; SECKLER, Marcelo Martins. Study of the influence of the water pH the determination of corrosive-ness of petroleum derivative on carbon steel. Corrosão e Protecção de Materiais, v.34, n.2, p.42-52, dez., 2015. 

Access to the article on the Journal’s website:
https://www.lneg.pt/wp-content/uploads/2020/01/Corros_Prot_Mater_Vol34_n2_2015.pdf


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