Abstract
Epoxy polymer, an illustrious barrier corrosion protective coating, was reinforced with metakaolin clay, an eco-friendly inorganic filler to enhance the barrier corrosion protection properties in water and in acidic environment on galvanized steel plates. Various proportions 0, 1, 3, 5, and 7 wt.% of metakaolin fillers were mixed intrinsically with kadilux epoxy and characterized for thermal stability, water absorption according to ASTM G31, and acid immersion according to ASTM D-570 standards, respectively. The reinforced coatings minimized the pore size and density, lower water absorption, and better acid resistance properties especially at 7 wt.% of the fillers. The thermal stability of the films improved beyond 5 wt.% of filler composition.
Highlights
Corrosion is an intrinsic problem in many industries like automobiles, sugarcane industries, maritime, petrochemical, and aerospace
To protect the metal substrate, many methods had been established such as barrier protection, anodic protection, and cathodic protection [1,2,3,4]
Kaolin clay was received from Jimma Science and Technology University, MK clay was prepared by heating the kaolin clay at temperature of 600°C for 3 hours in a high temperature box furnace, and galvanized steel sheet was manufactured by Adama sheet and steel factory
Summary
Corrosion is an intrinsic problem in many industries like automobiles, sugarcane industries, maritime, petrochemical, and aerospace. To protect the metal substrate, many methods had been established such as barrier protection, anodic protection, and cathodic protection [1,2,3,4]. Even though lots of advanced corrosion protection methodologies are available currently like cathodic protection, anodic protection, and alloys to suppress the corrosion processes, a barrier corrosion protective coating is mandatory. Epoxy tends to absorb polar water molecules during curing and on specific polar groups in the epoxy system [6]. This water molecules aid in corrosion and deadhesion of the coatings [7]. The absorbed water molecules can cause various forms of corrosion like pitting, crevice corrosion, intergranular corrosion, and selective leaching
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