Formation of Nano-Scale FeCO_3 Protective Corrosion Product in Carbon Dioxide-Saturated 3 Sodium Chloride Solution

摘要

Corrosion of carbon steel in CO_2 saturated NaCl solution contains the formation of FeCO_3, as a corrosion product. The protective property of the formed FeCO_3 scale layer to corrosion in brine solutions containing CO_2 was established as the possible cause of the corrosion rate decrease above 60 °C. In this study, formation of nano-scale FeCO_3 film as a corrosion product of X52 carbon steel in CO_2-Saturated 3% NaCl solution was investigated. Result showed that corrosion rate decreased after precipitation and formation of protective FeCO_3 film in high temperature and high bulk solution pH.