Abstract
Despite extensive work on improving atmospheric corrosion resistance in metals, i.e., steel and alloy, the corrosion rate on the metallic surface is higher at some localized geographical area of the globe. Despite the visible successes in recent coating technology in curbing environmental conditions, it is proposed that the recent increase of atmospheric bioaerosols has a significant role in the dissolution of corrosion-resistant coating over a metallic surface. In this review, the science of atmospheric corrosion on metallic materials was reviewed in the light of the chemical and physical composition of atmospheric bioaerosols and aerosols. It was observed that aside from general conditions (i.e., alloying element level, surface roughness, surface treatment, and microclimate), the bioaerosols content is essential for future research in corrosion. It is recommended that further experimental research be carried out to corroborate the science of atmospheric bioaerosols to different forms of corrosion.
Highlights
Atmospheric aerosol can be chemically or biologically oriented
The microstructural analysis of metallic surfaces affirms that bioaerosols and aerosols have the inherent properties of acting as traps to sustain a moist state during corrosion in the dry season
The microstructural analysis shows that bioaerosoldominated corrosion may most likely yield the pit corrosion and stress corrosion condition
Summary
Atmospheric aerosol can be chemically or biologically oriented. Sometimes, it appears as both chemically and biologically particulates that are suspended in the atmosphere. Its transportation in the atmosphere is unique because it is minute to be suspended and carried over far distances by trade winds In atmospheric sciences, this type of aerosols significantly influences the earth’s radiation balance, fog formation, cloud physics, and visibility degradation. Aside from the presence of the earth’s moisture and oxygen, the chem-aerosol components can collapse corrosion protective layers over the metallic surface. If the deposited chem-aerosol is present at the surface of the metallic material, it aids corrosion faster by reducing water’s thermodynamic activity. Morcillo et al [6] worked on long-term atmospheric corrosion of mild steel They expressed the complexities of chem-aerosols on corroding metallic surfaces. The enlightened research scientists that long-time (>50 years) exposure of mild steel reduces oxygen within the oxide layer and not at the metal or electrolyte interface. Scientists have suggested the pattern of MIC on different types of steels and metallic alloys [15,16,17,18]
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