Mild steel samples were studied by chronoamperometry in sodium sulfide (Na2S) aqueous solution. Pit nucleation and growth also were monitored by optical microscopy. The influence of variables such as temperature, polarization potential, surface roughness, the presence of electrochemically generated oxide layers, and the simultaneous presence of potassium hydroxide (KOH) was studied. The influence of each parameter on pit shape and growth was reviewed. Different reactions and competitive processes were proposed based on the experimental results.

Subject
Surface finishing, Pits, Water, Nucleation, Micrography, Aqueous solutions, Oxide surfaces, Current densities, Steel, Sulfides, Polarization, Electrodes, Electrode potential
Keywords:
aqueous solutions, chronoamperometry, mild steel, optical microscopy, pit nucleation, pitting, polarization, potassium hydroxide, potentiostatic, sodium sulfide
NACE International
1994
You do not currently have access to this content.