Development of galvanic coating (ZINC) for application in mils steel upon corrosive environment
Organic coated steel is widely used in industry because of well-known of its advantage towards corrosion protection. The objective is to understanding the physical appearances and behaviour of formulated organic coating and commercialized spray using SEM by investigating the internal reaction and en...
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| Format: | Research Report |
| Language: | English |
| Published: |
2017
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/36392/1/Development%20of%20galvanic%20coating%20%28ZINC%29%20for%20application%20in%20mils%20steel%20upon%20corrosive%20environment.wm.pdf http://umpir.ump.edu.my/id/eprint/36392/ |
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| Summary: | Organic coated steel is widely used in industry because of well-known of its advantage towards corrosion protection. The objective is to understanding the physical appearances and behaviour of formulated organic coating and commercialized spray using SEM by investigating the internal reaction and environment nature. Pigment volume concentration of formulated organic coating was varied as 10, 20 and 30 % to evaluate the effectiveness of coatings towards corrosion protection. There were four methods to identify the effectiveness of organic coating by adhesion test, immersion test, polarization test and thickness of the different layer (1, 3, 5 layers). In addition, the kinetic growth can be analyzed or interpret by using scanning electron microscope (SEM) for morphology observation. First, the samples were coated with the coating (commercialized spray and formulated organic coating). The „dry-on-dry‟ technique was implemented on these samples during painting or coating on the samples. After that, the samples were immersed in 3.5 % NaCl solution in duration at least 60 days. The thickness was measured by weighing before and after coating. The image of the sample for immersion test was taken from SEM analysis. The result of adhesion test for epoxy and zinc-epoxy shows high strength in chemical bonding. Lastly, the polarization test was takes place to determine the parameters of corrosion. The aim is to evaluate the efficiency of organic coating towards corrosion protection. The sample from formulated organic coating (10% PVC) show the highest corrosion rates, 0.00018 mm/yr. The formulation coating provides barrier protection while commercialized spray provides both galvanic and barrier protection from corrosion. |
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