Fabrication an‎d study on mechanical properties an‎d corrosion resistance of zinc rich epoxy coating modified with Graphene Oxide, Nanoclay an‎d 316 stainless steel micronized powder

3/19/2024 12:00:00 AM

Abstract: Nowadays, due to the widespread use of metals in various industries, it is very important to provide a suitable solution to protect them against corrosion. Since the corrosion of metals causes significant financial an‎d economic damage every year, many studies have been conducted in this field over the past years, an‎d among the many methods of protection against corrosion, the use of protective coatings due to the improvement of physical properties, mechanical, chemical as well as their reasonable price compared to other methods have attracted the most attention. Among these, organic-inorganic hybrid coatings have a special place among other coatings due to their high chemical an‎d thermal stability, good adhesion at high temperatures, hardness an‎d relatively easy coating. In this regard, the present study describes the preparation method of two-component an‎d three-component nanocomposites including reduced graphene oxide (RGO) an‎d montmorillonite nanoclay modified with sodium ion (Na-MMT) an‎d stainless steel L 316 in order to protect steel surfaces.The resulting nanocomposites after synthesis were analyzed by material identification methods such as FTIR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) an‎d transmission electron microscopy (TEM) an‎d then to eva‎luate their efficiency in creating resistance. Regarding corrosion, salt spray test an‎d electrochemical impedance spectroscopy (EIS) were used. For this purpose, RGO, Na-MMT an‎d stainless steel L 316 were added to the polymer in specific proportions (0.8, 0.4, 0.2% by weight). Based on the results of the salt spray test after 720 hours with 3.5% by weight of NaCl, the coating sample containing 3-component nanocomposite with 0.8% by weight showed very high an‎d favorable protection an‎d durability, also by comparing the results of the plate containing Nanocomposites, the two-component coating was less effective than the three-component coating with a percentage of 0.5, so that it was well protected against the chloride environment even after 21 days an‎d even up to 30 days. In addition, the results of electrochemical impedance spectroscopy showed that the charge transfer resistance of the coating containing 3-component nanocomposite with 0.8 weight percent (101287 Ω.cm2) is about two times larger than the coating containing 3-component nanocomposite with 0.5 weight percent (Ω.cm2 53473), more than four times larger than the coating containing 3-component nanocomposite with a weight percentage of 0.2 (Ω.cm2 23879) an‎d about seven times larger than metal alone (Ω.cm2 14112).Comparing these results with other reports showed that the prepared composite has a favorable performance compared to others. Keywords: Corrosion of metals, graphene oxide, montmorillonite nanoclay, 316 stainless steel, salt spray test.

خوردگي فلزات , گرافن اكسيد , نانو رس مونت موريلونيت , فولاد ضد زنگ 316 , آزمون مه پاشي نمك

Corrosion of metals , graphene oxide , montmorillonite nanoclay , 316 stainless steel , salt spray test

amirhossein tajrizi

roohollah rahmanifard