Friday, August 13, 2010

How to passivate & clean the Drycell .

The passivation process removes any unwanted metal ion deposits or residues from the stainless steel/any drycell surface

At one time nitric acid was used, but that had many drawbacks and would for our purposes destroy the cell plates.

Citric acid uses a different process, is very safe, cheap and has no after process problems. It can be disposed of without any environmental effects and is safe to handle (all unlike nitric acid)

The easiest way to passivated your cell plates is to finish building the cell, making sure to use the sanding process before assembly (cross hatch scoring with sand paper)
After assembly,then simply fill the cell fully .

Amount of usage:25g per 2~3 liters of water soak the drycell for 1~3 hours to descale,if the drycell is heavily scaled, (after 10000km)soak it overnight for 8~10 hours the concentration may increase to 25g per liter of water.

Wash out with plain water, rinse out with distilled water, blow air through the cell to dry it out, blow oxygen inside the cell if available or leave in dry condition over night.

After the passivation or cleaning process has been completed, flush with distilled or demineralised water.

Suitable to clean Titanium cell, SS cell, Super Alloy Nickel cell

*The citric acid is not suitable for cleaning iron,bronze ,aluminum,brass,gunmetal, etc. Remove any bronze connector if any before the cleaning process.

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