DEVELOPMENT OF SHEET STEEL GROUNDCOAT ENAMEL FROM LOCAL RAW MATERIALS
DEVELOPMENT OF SHEET STEEL GROUNDCOAT ENAMEL FROM LOCAL RAW MATERIALS
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Date
1993-12
Authors
OKOLIE, Peter Nnaji
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Abstract
An investigation into the development of sheet steel
groundcoat enamel from local raw materials was carried out.
These local raw materials included: feldspar, quartz,
magnesite, whiting, baryte and manganese dioxide.
Several formulations were made. Of the five
formulations that yielded best performance properties,
enamel B had the highest local input of raw materials of 84
percent, followed closely by D with 78 percent, then A with
71.5 percent, C with 68 percent and finally E with 64
percent. Borax or boric acid constituted about 95 percent of
the fore i gn input.
The raw materials were smelted and fritted using the
quenching method of fritting. Complete fusion of batch raw
materials was attained after 1.5 - 3 hours. Enamel E had
the lowest maturing temperature of 1080°C, followed by A
with maturing temperature of 1115°C, C and D had 1150°C
maturing temperature while B matured at 1200°C.
The enamels were applied on low carbon sheet steel test
pieces. Firing was carried out at 840°C - 880°C for 4 -12
minutes. Firing at the higher temperature range for shortertime
yielded better performance properties than at lowertemperature
range for longer time. The enameled samples
were tested for fundamental performance properties. The
coating thickness varied from 0.40mm - 0.48mm.
When heated and quenched for eight successive
temperatures of 170, 175, I8O, 185, 190, 195, 200 and 205°C,
the enameled samples showed no signs of crazing, flaking off
or cracking. When exposed to a 10 percent solution of
citric acid for 15 minutes, enamels B, D and E showed no
damage in appearance and relative cleanabi1ity while A and C
failed this acid resistance test. There were no resultant
damage to the enamel coating when subjected to impact test.
The order of gloss and desired colour is:
E > A > D > C > B
When compared with industrial standands 11 and I2, all the
formulations A, B, C, D, and E yielded successful
performance properties but enamel E proved most successful.
Description
A THESIS
SUBMITTED TO
The Postgraduate School
Ahmadu Bello University, Zaria
BY
OKOLIE Peter Nnaji
In Partial Fulfillmen of the requirements
for the Degree of Master of Science
(Chemical Engineering)
Department of Chemical Engineering
Ahmadu Bello University,
Zaria - Nigeria
DECEMBER, 1 993
Keywords
DEVELOPMENT,, SHEET STEEL,, GROUNDCOAT,, ENAMEL,, RAW MATERIALS