Cleaning and liquid contact with solids – Processes – Using sequentially applied treating agents
Patent
1988-09-09
1989-12-12
Kaplan, G. L.
Cleaning and liquid contact with solids
Processes
Using sequentially applied treating agents
134 28, 134 41, 204 1T, 204434, C23G 102, C23G 108, C23G 110, C23G 112
Patent
active
048865524
ABSTRACT:
A method for simultaneously removing and monitoring the removal of a metallic contaminant from the surface of a metallic workpiece is disclosed. The workpiece and a reference electrode are immersed in an electrically conductive cleaning solution. The potential difference between the workpiece and the reference electrode is periodically measured to generate a series of potential difference values. Differences between successive potential difference values of the series are quantified to generate a noise parameter value. The noise parameter value is compared to a reference value, wherein the reference value is indicative of a maximum allowable amount of contaminant, to determine if an amount of contaminant greater than the maximum allowable amount of contaminant is present on the surface of the workpiece.
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Gruver Gary A.
Jaworowski Mark R.
Kaplan G. L.
United Technologies Corporation
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