Corrosion scales and passive films: general discussion

Abstract

Philippe Marcus asked: If the defects are neutral, one would expect no effect of the electric eld on oxide growth. Is this what you suggest?Mira Todorova responded: This is a very interesting suggestion to experimentally verify the existence/presence of charge neutral defects. We have not considered this aspect in our paper but would like to call for corresponding experiments in the region of phase space where such defects are predicted to be thermodynamically stable.Hendrik Bluhm questioned: Have you considered the presence of a hydroxide phase at the interface between ZnO and water? How would the presence of the hydroxide phase inuence your model on the role of point defects in governing the growth/dissolution of the oxide formed on Zn?Mira Todorova answered: A hydroxide phase at the interface was not considered. We chose ZnO for two reasons: (i) because of the availability of a vast amount of relevant data found for ZnO in the semiconductor literature and (ii) because ZnO is mentioned in the experimental literature on corrosion, as being the rst compact oxide layer formed during corrosion on ZnO. 1 The methodology presented in our work can be equally well applied to a hydroxide phase. Unfortunately, to our knowledge the information about the point defects forming in a Zn-hydroxide, which is needed for our thermodynamic model, is not available in the literature yet. Once we have performed the necessary density-functional theory calculations for the point defects in the hydroxide phase, the presence of the hydroxide phase can be explicitly considered.

Effect of Cations on the Oxidation and Atmospheric Corrosion of Iron Interfaces to Minerals

“…Inorganic thin films are a complex mixture of minerals produced on the surface of metals from corrosion and other complex mechanisms. , The chemical composition of the mineral depends upon the metal and the chemical composition of solutions, solution pH, temperature, and gases in the environment. − Atmospheric dust and other particulate matter that settle on metal surfaces can also lead to corrosion, such as in the crevice phenomenon, where the small space between dust and the surface of the corroding species traps water easily, and fluctuations in relative humidity cause dissolved ions to deposit onto the surface of the substrate, increasing corrosion rates. , Corrosion reactions and mineral formation are complex in nature as gases and ions in electrolytes come in contact with metal surfaces, producing oxides, hydroxides, and carbonates. − …”

Anticorrosive Effects of Some Thiophene Derivatives Against the Corrosion of Iron: A Computational Study

“…One of the serious problems in industrial sector is the corrosion of metals or alloys, which causes great casualties and enormous property loss (Frankel et al, 2015 ; Li et al, 2015 ). The most environmentally-benign and cost-effective approach to prevent metals against corrosion in acid solutions is using of inhibitors (Raja et al, 2016 ).…”

Synergistic effect of potassium iodide and sodium dodecyl sulfonate on the corrosion inhibition of carbon steel in HCl medium: a combined experimental and theoretical investigation

“…8,9 It is generally believed that these inhibitor molecules protect the metal by adsorption on the substrate surface through donoracceptor interactions. 10 Some scholars have conrmed that multi-active compounds with large molecular volume tend to have better inhibition performance. [11][12][13] However, there are still huge challenges in chemically synthesizing such inhibitors.…”