# Hull cell

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{{Short description|Measuring instrument used in electroplating}}
thumb|300px|A Zinc solution tested in a Hull Cell
The '''Hull cell''' is a type of test cell used to qualitatively check the condition of a [electroplating](/source/electroplating) bath. It allows for optimization for [current density](/source/current_density) range, optimization of additive concentration, recognition of impurity effects and indication of macro-throwing power capability.<ref>{{Citation | title = Metal Finishing: Guidebook and Directory Issue 98 | page = 588 | year = 1998 | volume = 95}}.</ref> The Hull cell replicates the plating bath on a lab scale. It is filled with a sample of the plating solution, an appropriate [anode](/source/anode) which is connected to a [rectifier](/source/rectifier). The "work" is replaced with a hull cell [test panel](/source/test_panel) that will be plated to show the "health" of the bath.

The Hull cell is a trapezoidal container that holds 267 ml of solution. This shapes allows to place the test panel on an angle to the anode. As a result the deposit is plated at different current densities which can be measure with a hull cell ruler. The solution volume allows for a quantitative optimization of additive concentration: 1&nbsp;gram addition to 267 mL is equivalent to 0.5 oz/gal in the plating tank.<ref>[http://www.allbusiness.com/manufacturing/chemical-manufacturing-paint/3993213-1.html Hull Cell 101]</ref>

== References ==
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Category:Metal plating

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