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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.17 [2010] >
IJCT Vol.17(3) [May 2010] >
| Title: | Influence of galvanic coupling on the formation of zinc phosphate coating |
| Authors: | Arthanareeswari, M
Narayanan, T S N Sankara
Kamaraj, P
Tamilselvi, M |
| Keywords: | Zinc phosphate
Corrosion resistance
Galvanic couple
Mild steel |
| Issue Date: | May-2010 |
| Publisher: | CSIR |
| Abstract: | The influence of galvanic coupling of mild
steel (MS) with titanium, copper, brass, nickel and stainless steel (SS) on the
phosphatability is elucidated. The galvanic couple accelerates metal dissolution,
enables quicker consumption of free phosphoric acid and facilitates an earlier
attainment of point of incipient precipitation, resulting in higher amount of
coating formation. The surface morphology of the coatings exhibit more uniform
coating for the mild steel substrates phosphated under coupled conditions. XRD
pattern of the zinc phosphate coating formed under coupled condition confirms
the presence of phosphophyllite rich coating. The potential-time measurements
are also carried out. The study reveals that galvanic coupling of mild steel
with metals that are nobler than steel during phosphating proved to be
beneficial in accelerating the coating formation. |
| Page(s): | 167-175 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.17(3) [May 2010]
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