http://www.finishingtalk.com/community/topic124$2.html The most recent posts in Bright dip for brass silver articles. Fri, 18 May 2007 23:15:30 +0000 PunBB http://www.finishingtalk.com/community/post689.html#p689 [color="DarkSlateBlue"]"3"[/color] info@finishingtalk.com (Southern Metal Finishing) Fri, 18 May 2007 23:15:30 +0000 http://www.finishingtalk.com/community/post689.html#p689 http://www.finishingtalk.com/community/post619.html#p619 Rajaram60, FYI- As with many other bright dip processes, the reaction that takes place between the part being processed and the Nitric Acid in the tank can create a dark reddish-brown NOx plume. NOx is a biproduct of the reaction, which consists of Nitric Oxide and Nitrogen Dioxide gases. Nitrogen Dioxide gas is toxic and potentially lethal by inhalation. Long term exposure can cause adverse respiratory conditions. The tank should be ventilated with a properly designed local exhaust ventilation system made from chemical resistant materials such as PVC. Since the plume is visible you'll probably want to scrub it as well so the neighbors don't complain. The smaller the tank, the better. I know it sounds expensive, but I'm sure you know since you also hard chrome plate. In a lab environment, just make sure the fumes are carried away by a lab hood. The NOx gas is generally only created while the part is being processed. Good Luck, Kyle Hankinson - CEF [url]www.kchservices.com[/url] info@finishingtalk.com (ScrubberPro) Thu, 12 Apr 2007 21:14:33 +0000 http://www.finishingtalk.com/community/post619.html#p619 http://www.finishingtalk.com/community/post242.html#p242 Well how did the trials go? info@finishingtalk.com (zurv) Thu, 10 Aug 2006 05:37:36 +0000 http://www.finishingtalk.com/community/post242.html#p242 http://www.finishingtalk.com/community/post232.html#p232 Hi Donvan Many thanks for your advice on bright dip for copper.I am pretty sure that it will work out well.Will give you the feed back after the trials thanking You rajaram60 info@finishingtalk.com (rajaram60) Tue, 01 Aug 2006 12:56:08 +0000 http://www.finishingtalk.com/community/post232.html#p232 http://www.finishingtalk.com/community/post231.html#p231 Hi rajaram60. One formulation for bright dipping of copper alloys is: Sulfuric Acid 50%/vol. Nitric Acid 20%/vol Hydrochloric Acid 0.5 oz/gal. DI Water Balance The nitric and sulfuric can be adjusted based on the alloy you are processing. I would experiment with samples prior to processing valuable articles. Good Luck. info@finishingtalk.com (Ira Donovan) Tue, 01 Aug 2006 12:38:53 +0000 http://www.finishingtalk.com/community/post231.html#p231 http://www.finishingtalk.com/community/post229.html#p229 Dear members while I have got several books on plating I am yet to find a proper combination of chemicals to get brightness for brass and silver articles.I am also interested in buying direct dip coating for small articles to get golden finish (dip gold ) Since I am specialised in Hard chrome plating with 30 years of exp I am trying to do innovations in brightening old articles. Thanks to you all and finishing talk Rajaram60 info@finishingtalk.com (rajaram60) Tue, 01 Aug 2006 09:45:19 +0000 http://www.finishingtalk.com/community/post229.html#p229