chromating


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Related to chromating: Phosphating, anodizing

chromating

[′krō‚mād·iŋ]
(metallurgy)
Performing a chromate treatment.
References in periodicals archive ?
The zinc-plated items follow the chromating sequence composed of five operations: (1) immersion in the chromatation tank ([Cr(VI)] = C) during a determined time, with TCr equal to 20 or 40 s; (2) first rinsing in a dead-rinse tank ([Cr(VI)] = C/2 or C/100) for 15 or 30 s ([TR.sub.1]); (3) draining over the rinse tank for 15 to 45 s ([TDr.sub.1]); (4) rinsing in a live-rinse tank ([Cr(VI)] = C/200 or C/1000) for 60 or 150 s ([TR.sub.2]); and (5) draining over the rinse tank for 60 to 120 s (TDr.sub.2]).
* [U.sub.3]: concentration of the Cr(VI) ion (mol [L.sup.-1]) in the first rinse after chromating treatment
* [U.sub.6]: concentration of the Cr(VI) ion in the second rinse after chromating treatment (mol [L.sup.-1])
For the confounded interaction effect [l.sub.12] (= [b.sub.12] + [b.sub.35] + [b.sub.46] + [b.sub.78]), we can assume that the factor interaction effect [b.sub.12] is the dominant term since pH ([X.sub.1]) and chromating time ([X.sub.2]) have the greatest effects on the response, as emphasized in the literature.
Considering the confounded interaction effect [l.sub.34] (= [b.sub.34] + [b.sub.17] + [b.sub.28] + [b.sub.56]), we can assume that [b.sub.34] (interaction between concentration of Cr(VI) content in the first rinse ([X.sub.3]) and time of first rinse ([X.sub.4])) is the dominating term since the interaction between the chromating time ([X.sub.2]) and the time of the second draining ([X.sub.8]) is highly improbable.