Recent Progress and Required Developments in Atmospheric Corrosion of Galvanised Steel and Zinc

Abstract

This paper reviews the progress in atmospheric corrosion of zinc since 2009. It firstly summarises the state of the art in 2009, then outlines progress since 2009, and then looks at the significance of this progress and the areas the need more research. Within this framework, it looks at climate effects, oxide formation, oxide properties, pitting, laboratory duplication of atmospheric corrosion, and modelling. The major findings are that there have been major advances in the fields understanding of the structure of corrosion patina, in particular their layered structure and the presence of compact layers, local corrosion attacks have been found to be a significant process in atmospheric corrosion and experiments under droplets are leading to new understanding of the criticality of drop size in regulating atmospheric corrosion processes. Further research is indicating that zinc oxide within corrosion products may promote the oxygen reduction reaction (ORR) and that, in porous oxides, the ORR would control pore chemistry and may promote oxide densification. There is a strong need for more research to understand more deeply the formation and properties of these layered oxides as well as additional research to refine and quantify our emerging understanding of corrosion under droplets.

Atmospheric corrosion patterns of electrogalvanized mild steel at east southern coastal areas of CPEC

“…Corrosivity of marine test sites has been studied worldwide, and the environmental parameters are reported …”

“…Galvanized steel is well known for its high resistance to atmospheric corrosion and has a wide range of application from the automotive and marine industries to fluid transport systems . Galvanized steel corrosion has been studied by a vast number of researchers throughout the world . Pattern of atmospheric corrosion was mainly determined by corrosivity of environment and corrosion resistant nature of materials which in turn depend upon various meteorological factors, pollutant levels and protective nature of corrosion products …”

Oxygen Reduction Investigation on Sputtered ZnO Layers with Nano‐granular Structure

“…By implementing Equations (10) and (11) in Equation (5), one obtains the dependence of I d on the rate constants and the rotation rate Ω:…”

“…However, its electrochemical behavior is not well understood yet, in particular towards ORR, and there is still a debate for results obtained in immersion and under atmospheric conditions, as recalled by Cole's recent review. [11] Different results were also obtained with native (passive) zinc oxide layers on bare zinc and thicker ZnO coatings (ca. hundreds of nanometers) that were artificially produced, as summarized below.…”

Impedance Spectroscopy Analysis of Structural Defects in Sputtered ZnO Films

“…A negative polarization was applied to the sputtered ZnO electrodes since the present study was carried out in the context of the investigation of the cathodic properties of ZnO . The cathodic activity of ZnO is still debated in the literature, as reminded by Cole in a recent review on zinc corrosion . A previous work of our group presented the electrokinetic properties of sputtered ZnO layers towards oxygen reduction …”