After completing the process in the plating
bath, the work is emersed in the first water
bath, where most of the residuals from the plating
bath are removed. Because these residuals
simply dissolve in the rinse water, they are
present on the surface of the rinsed work in
proportion to their concentration in the rinse
water. Therefore, it is necessary to rinse the
work in a cleaner bath after the first rinse, and
so on, until the work is sufficiently clean. Each
time an object is removed from an emersion
tank, it brings a certain amount of the bath
solution (dragout) with it. Dragout contaminates
the next emersion solution or rinsewater
bath. Use of air squeegees and/or longer drip
times can minimize dragout. Figure 4-2 shows
a typical rinsing sequence for an electroplating
process.
It is common to have three rinse tanks in
series and advisable to have them set up
such that fresh makeup water is added to the
final rinse tank, ensuring a concentration
of “impurities” sufficiently low that the rinsed
After completing the process in the platingbath, the work is emersed in the first waterbath, where most of the residuals from the platingbath are removed. Because these residualssimply dissolve in the rinse water, they arepresent on the surface of the rinsed work inproportion to their concentration in the rinsewater. Therefore, it is necessary to rinse thework in a cleaner bath after the first rinse, andso on, until the work is sufficiently clean. Eachtime an object is removed from an emersiontank, it brings a certain amount of the bathsolution (dragout) with it. Dragout contaminatesthe next emersion solution or rinsewaterbath. Use of air squeegees and/or longer driptimes can minimize dragout. Figure 4-2 showsa typical rinsing sequence for an electroplatingprocess.It is common to have three rinse tanks inseries and advisable to have them set upsuch that fresh makeup water is added to thefinal rinse tank, ensuring a concentrationof “impurities” sufficiently low that the rinsed
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