2008-09-09T18:32:32Z PunBB http://www.finishingtalk.com/community/topic699$2.html <p><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 115%; FONT-FAMILY: "Arial","sans-serif"">Calcium can be precipitated out of solution as CaF₂. Use only as much fluoride as required as excess fluoride may attack titanium baskets and heating coils. <span>&#xa0;</span>With bath in a clean treatment tank, heat and maintain above 170 deg F.<span>&#xa0; </span>Use as much agitation as possible. Add either of the following per 100 ppm of Ca to be removed:<br />ammonium bifluoride = .06 grams/liter<br />sodium Bifluoride = .12 grams/liter<br />You may sprinkle a small amount of boric acid on the surface to promote nucleation.<span>&#xa0; </span>Allow to mix for 60 minutes. Filter back to plating tank and adjust temperature.</span></p> TechmanBob 2008-09-09T18:32:32Z http://www.finishingtalk.com/community/post1746.html#p1746 <p>Have you tried to treat a small portion of the bath with potassium fluoride?&#xa0; A great deal of the calcium will for calcium fluoride which will precipitate and can be filtered from the solution.&#xa0; Caution:&#xa0; Run a trial on a small sample (1 liter) before you add the material to your working solution</p> gregdant 2008-09-09T14:26:26Z http://www.finishingtalk.com/community/post1744.html#p1744 <p>We have a problem with calcium metaborate in bright nickel solution.&#xa0; Does anyone know how to remove this?&#xa0; According to our information it does not work in the same way as calcium sulfate (i.e. heat and filter).&#xa0; Is there another way?</p><br /><p></p> John Reid 2008-06-27T00:14:56Z http://www.finishingtalk.com/community/post1625.html#p1625