BRONZE IMMERSION PLATING ON MILD STEEL IN CYANTDE-FREE SOLUTIONS:
BRONZE IMMERSION PLATING ON MILD STEEL IN CYANTDE-FREE SOLUTIONS:
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Date
2015-01-27
Authors
BIJIMI, DOGARA
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Abstract
Bronze immersion plating on mild steel was successfully carried out in cyanide-free
solutions. The plating solutions contained cupric and stannous chloride:;
(hydrated) of various proportions; the most common being 4-10 g/L
CuCl2.2H20 and 8-20 g/L SnCl2.2II20. The plating took place in aqueous,
non aqueous and akamu media. Non aqueous media comprised of methanol,
ethanol, propanol and butanol. The plating was performed at a temperature
of 25°C. The addition of NaCl, KC1 and BaCl2 promotes plating rate approximately
in that order. Similarly, the addition of thiourea, I,-cysteine
and sodium dithionate to the plating solutions enhances coating thickness
growth. However, the addition of IIC1 to the plating solutions retards
plating rate.
The immersion plated substrates were later electroplated in aqueous
medium, non aqueous media (alcohols), mixed aqueous (water/alcohols, water/
acetone),99% acetone and 37% formaldehyde containing hydrated cupric
and stannous chlorides of 100 g/L each. The plating rate favours lower
molecular weight alcohols, aqueous, mixed water/acetone and 37% formaldehyde
media approximately in that order compared to akamu and 99% acetone. The
addition of nitric, acetic and formic acids to plating solution also promotes
plating rate.
Description
Dissertation submitted to the Post GraduateSchool,
Ahmadu Bello University, Zaria for
the Degree of Doctor of Philosophy
Department of Metallurgical Engineering,
Faculty of Engineering,
Ahmadu Bello University, Zaria, Nigeria
Keywords
BRONZE,, IMMERSION,, PLATING,, MILD STEEL,, CYANTDE-FREE,, SOLUTIONS: