Zinc orthophosphate has been used for many years
as a corrosion inhibitor without a true understanding
of its actual contribution to corrosion control. This
study examined whether reduced or nonzinc
orthophosphate is as effective as zinc orthophosphate
for protection of piping materials.
The authors reviewed the literature as well as case
studies of utilities that had switched from zinc to nonzinc
corrosion inhibitors. Pilot-testing was then conducted
at six New Jersey water treatment plants to
assess the effect of corrosion inhibitors with and without
zinc on new metal coupons.
For protection of metal pipes, zinc does not appear
to play an important role. Orthophosphoric acid was
found to be as effective as zinc orthophosphate for
protection of metal piping materials and is less expensive
on a phosphate basis. In addition, converting from
zinc orthophosphate to a nonzinc alternative translates
into less zinc that is released into the environment or
must be removed from wastewater. Includes 15 references, tables.
| Edition : | Vol. 99 - No. 11 |
| File Size : | 1
file
, 220 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 11/01/2007 |
