Study on the effect of atmospheric corrosion on mechanical properties with impact test: Carbon steel and Galvanized steel

Abstract

The present work presents the behavior of carbon steel and galvanized steel against atmospheric corrosion after 3 years of exposure at seven locations around the region of Valparaiso, Chile. Results show a relation between corrosion rates and environmental and meteorological conditions, categorized as CX for the Quintero zone, and C3 and C2 in the remaining six zones. Corrosion rate behaviors and material toughness losses were modeled using power functions and neural networks, found to be a function of environmental exposure time. Losses were greater for carbon steel in coastal and industrial environments, reaching 70 to 80%. This effect was reduced in galvanized steel, not exceeding 15% over the same period of exposure. The relationship between corrosion rate and loss of toughness of both materials was modeled using neural networks. K E Y W O R D S atmospheric corrosion, carbon steel, galvanized steel, industrial environments, marine environments, SEM, toughness, weight loss, XRD

Physicochemical studies of galvanized steel corrosion in urban, industrial, and marine environments, and corrosion mapping of Karachi city: An important coastal city of the 21st‐century modern maritime silk route

“…[4,13,15,35] Results obtained from the current study are in agreement with the findings of other researchers. [3,4,6,36] 3.3 | Corrosion rates of galvanized steel and kinetic parameters Figure 3 shows the corrosion rates of galvanized steel observed from July 2018 to June 2019 at the urban, industrial, and marine test sites located in Karachi coastal city. It was observed that the corrosion rates decreased with the exposure time.…”

“…SEM provides useful information about the morphology and structure of the corrosion products' layer. [14,15,[35][36][37] Figures 6 and 7 show the SEM images of the galvanized steel after 12 months of exposure at the urban, industrial, and marine test sites located in Karachi coastal city, and Table 3 demonstrates the morphologies of the corrosion products formed. For nearly all the test sites, these images illustrated that the corrosion products formed on galvanized steel were not compact and sometimes contained cracks.…”

“…It is well documented that the exposure conditions, nature of pollutants, and their concentration greatly influence the composition of the corrosion products of zinc. [14,15,[35][36][37] Zincite and hydrozincite are the initial corrosion products of zinc. In the atmosphere with high chloride concentration, these ions penetrate the hydrozincite layer through pores and defects and then replace carbonate ions to form a simonkolleite, which provides poor anticorrosion protection to the base metal.…”

Novel synthesis of a self-healing Ce based eco-friendly sealing coating to mitigate corrosion in insulators installed in industrial regions

“…The pH of rain varies in the range of 3.2-5.1 in extremely polluted industrial sites of Korea. [3][4][5] Under continuous exposure to an industrial environment, the galvanized lm of the insulator pin would be transformed into other atmospheric products rapidly. These corrosion rates would be faster enough to cover galvanized surfaces with corrosion byproducts in no more than 5-10 years.…”

Evaluation of atmospheric galvanic aluminum corrosion in electrical transmission towers at different sites in the Valparaíso region, Chile. Wire‐on‐Bolt Test (CLIMAT)

“…Atmospheric corrosion is a complex process, highly sensitive to local environmental conditions. [1][2][3][4] The degree of metal deterioration and the type of corrosion product that forms on the surface of metals are directly related to the type of atmosphere it is exposed to, climatic factors, and pollutants. [5,6] Thus, any company making use of metal infrastructures exposed to different types of atmosphere-such as in the electrical sector-are aware of the impact of atmospheric corrosion.…”