Studies of epoxy powder coated galvanized steel substrate via electrostatic powder coating system
This research deals with epoxy powder coating on the electrolytic galvanized steel sheet via electrostatic powder coating system. Normally, the film thickness and powder coverage of the coated powder is not optimum. It leads to non- protection of the parts from rusty and corrosion besides havi...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2012
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/2279/1/24p%20MOHD%20RAZALI%20AJER.pdf http://eprints.uthm.edu.my/2279/2/MOHD%20RAZALI%20AJER%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2279/3/MOHD%20RAZALI%20AJER%20WATERMARK.pdf |
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| Summary: | This research deals with epoxy powder coating on the electrolytic galvanized steel sheet
via electrostatic powder coating system. Normally, the film thickness and powder
coverage of the coated powder is not optimum. It leads to non- protection of the parts
from rusty and corrosion besides having many defects such as orange peel, rough
surface, poor adhesion and inconsistencies of colour tone. In order to produce good
coating quality, the processing parameters must be optimized. In this research, there have
three variable parameters need to investigate. The variable parameters are total air
volume, powder output and spraying distances. These parameters were screening to
determine the significant effects to the coating quality. The screening result shows the
spraying distance does not have significant effects and it was discarded. The experiments
were carrying out to determine the optimum combination of powder output and total air
volume. It is purposely to produce sample with good coating quality besides improved
the first pass transfer efficiency (FPTE). All samples were tested using same processes
that are pre-treatment, dry-off, powder spraying and curing. The method used to
investigate the coating characteristic are thickness measurement, Buchholz indentation
test, cross cut test, colour visual checking, particle cross-linking struture and surface
profile analysis. The instruments used to evaluate the samples are coating thickness
gauge, Buchholz indentor, multi blade cutting tools, spectrophotometer, scanning
electron microscope (SEM) and surface profiler. The experimental result shows the
combination of 4.0 m³/h of total air volume and 150 g/min of powder output produce
good coated sample with optimum thickness and colour tone. It also has good particle
crosslinking structure and surface profiler. The coating indentation resistant and
adhesion for this sampe is able to protect the galvanized steel from corrosion and rusty. |
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