Open AccessEnvironmental Effect on Fatigue Behavior of Epoxy Coating Used for Water Tanks
Author(s) -
Haider Hadi
Publication year - 2020
Publication title -
jordanian journal of engineering and chemical industries
Language(s) - English
Resource type - Journals
eISSN - 2617-720X
pISSN - 2616-9584
DOI - 10.48103/jjeci382020
Subject(s) - epoxy , polyamide , materials science , coating , composite material , fatigue limit , porosity , absorption of water
The fatigue limit and lifetime of epoxy-based coatings may be affected by various factors, especially the environmentaleffects. This paper evaluates the impact of air, potable water media, and pollution gases (CO2, H2S, and SO2) on thefatigue performance of two types of epoxy-based coatings (polyamine and polyamide epoxy-based coatings) used aslining for potable water storage tanks. The fatigue test apparatus is assembled in the laboratory and utilized for testing.Different factors are discussed, including absorption, adsorption, and the reaction of environmental gasses withpolyamine and polyamide coating surfaces. The influence of porosity on the epoxy-based coatings is experimentallydetermined, and its effects on fatigue limit and fatigue life are discussed in detail. As a result, the coatings were appliedto improve the fatigue resistance of stainless steel. The fatigue limits of both types of coatings tested in potable waterare lower than the value obtained when tested in air or gas environments. The fatigue limit of polyamine coating is greaterthan the polyamide coating. The microscopic inspection indicated a different mechanism for initiating fatigue crack, andthe test environments are affected by the nature of the fracture surface.