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Title

INVESTIGATION OF SELF-HEALING ABILITY OF COATINGS BASED ON MICROCAPSULES FOR CORROSION PROTECTION OF STAINLESS STEEL IN ACID SOLUTION

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Abstract

 ONE OF THE MOST SIGNIFICANT TYPES OF SMART COATINGS IS SELF-HEALING COATING, WHICH HAS THE ABILITY TO RELEASE ENCAPSULATED ACTIVE AGENTS IN A CONTROLLED WAY [1]. THEY CAN BE EMPLOYED TO DEVELOP A NEW FAMILY OF SMART MULTIFUNCTIONAL COATINGS. INCORPORATING MICROCAPSULES IN COATING MATRIX PROVIDES RELEASE OF REPAIRING AGENT RAPIDLY AFTER TRIGGERING DUE TO CRACK PROPAGATION IN COATINGS AND GIFTS THE SELF-HEALING TO THE COATINGS. THE SELF-HEALING ABILITY OF COATINGS INCORPORATED WITH MICROCAPSULES CONTAINING LINSEED OIL WAS EVALUATED IN THIS WORK. UREA-FORMALDEHYDE MICROCAPSULES CONTAINING LINSEED OIL WERE SYNTHESIZED BY IN-SITU POLYMERIZATION AS A MAJOR PROCEDURE FOR FABRICATION OF MICROCAPSULES [2]. THE MICROCAPSULES WERE INCORPORATED THROUGH EPOXY COATINGS AND THE COATINGS WERE APPLIED ON STAINLESS STEEL PANELS. IN THIS STUDY, THE MICROCAPSULE CONCENTRATION WAS CHOSEN AS 5, 10 AND 20 WT%. ALSO A COATING WITHOUT MICROCAPSULES, CALLED BLANK, WAS PREPARED AS A CONTROL. AFTER 6 DAYS OF CURING AT AMBIENT TEMPERATURE, CROSS-CUTS WERE MADE ON THE COATING SAMPLES BY A RAZOR BLADE. THE SCRIBED SAMPLES WERE IMMERSED IN 0.5 M H2SO4 SOLUTION AT AMBIENT TEMPERATURE. THE SELF-HEALING PERFORMANCE OF THE COATINGS WAS INVESTIGATED BY OPTICAL MICROSCOPIC AND ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (EIS) METHODS. THE CONCENTRATION OF THE EMBEDDED MICROCAPSULES AFFECTED THE SELF-HEALING CAPABILITY. ACCORDING TO THE RESULTS IT CAN BE CONCLUDED THAT THE WEIGHT FRACTION OF MICROCAPSULES SHOULD NOT BE LOWER THAN 10% IN ORDER TO ACHIEVE GOOD SELF-HEALING PROPERTY. FIG. 1 SHOWS THE OPTICAL MICROGRAPHS OF THE SCRATCHED AREA ON THE BLANK AND COATING SAMPLE CONTAINING 10% MICROCAPSULES. IT CAN BE CLEARLY SEEN FROM THIS FIGURE THAT THE 10% COATING SAMPLE EXHIBITED A REASONABLE SELF-HEALING BEHAVIOR.

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