Effect of anodic dissolution and passivation on X80 steel in NaHCO3 solution

Abstract

The effects of extreme stray current on the anodic dissolution and passivation of X80 steel in NaHCO3 solution were investigated using measurements of polarization curves and EIS, AFM and SEM techniques. Under the interference of anodic current (i = 0~200 A/m2), main constituents of corrosion products of X80 steel were FeO(OH) and Fe3O4. A double-layer film formed at i = 100 A/m2, in which FeOOH was in outer and Fe3O4 lied in inner. The formation mechanism of Fe3O4 was confirmed and described by the electrochemical reaction in various regions on anodic potentiodynamic polarization curve.

Corrosion behavior and mechanism of X80 steel in silty soil under the combined effect of salt and temperature

“…The petal-like sediment layer with cracks on the surface has already reached a critical thickness when the temperature is 283.15 K, leading to poorer layer adhesion and causing sediment to easily peel off from the surface. 40 When the temperature was decreased to 278.15 K, the surface of X80 steel was covered with looser flocculent sediments. When the temperature was 273.15 K, the corrosion rate of X80 steel in the two corrosive environments was similar, and when the soil temperature decreased to 263.15 K, the sulfate-containing silty soil was more corrosive than the chloride-containing silty soil.…”

Dissolution of Stainless Steel in Sodium Chloride Solution at Polarization by Non-Stationary Current

“…The effect of extreme stray current on the anodic dissolution and passivation of X80 steel in NaHCO3 solution were studied by drawing polarization curves and using EIS, AFM, and SEM methods. During anodic current polarization (i=0~200A/m2) it was determined that the components of X80 stainless steel corrosion products were FeOOH in outer and Fe3O4 lied in inner [10].…”