Pickled cucumber apple cider vinegar
On this Wikipedia the language links are at the top of the page across from the article title. Metal surfaces can contain impurities that may pickled cucumber apple cider vinegar usage of the product or further processing like plating with metal or painting.
Various chemical solutions are usually used to clean these impurities. Many hot working processes and other processes that occur at high temperatures leave a discoloring oxide layer or scale on the surface. In order to remove the scale the workpiece is dipped into a vat of pickle liquor. Prior to cold rolling operation, hot rolled steel is normally passed through a pickling line so as to eradicate the scale from the surface. The primary acid used in steelmaking is hydrochloric acid, although sulfuric acid was previously more common.
Hydrochloric acid is more expensive than sulfuric acid, but it pickles much faster while minimizing base metal loss. In jewelry making, pickling is used to remove the copper oxide layer that results from heating copper and sterling silver during soldering and annealing. A diluted sulfuric acid pickling bath is traditionally used, but may be replaced with citric acid. For this reason, a thin film of oil or similar waterproof coating is applied to create a barrier to moisture in the air. This oil film must later be removed for many fabrication, plating or painting processes. Acid cleaning has limitations in that it is difficult to handle because of its corrosiveness, and it is not applicable to all steels. Hydrogen embrittlement becomes a problem for some alloys and high-carbon steels.
The hydrogen from the acid reacts with the surface and makes it brittle, causing cracks. Pickling sludge is the waste product from pickling, and includes acidic rinse waters, iron chlorides, and metallic salts and waste acid. Spent pickle liquor is considered a hazardous waste by the EPA. In the SCS process, surface oxidation is removed using an engineered abrasive and the process leaves the surface resistant to subsequent oxidation without the need for oil film or other protective coating.
FIN 2002: Annual International Technical Conference June 24-27, 2002, Chicago, IL. Orlando, FL: American Electroplaters and Surface Finishers Society. Resource recovery and recycling from metallurgical wastes. Handbook of Advanced Industrial and Hazardous Wastes Treatment. This article is about the food preparation method. For the food created using this method commonly called “pickles” in the United States and Canada, see pickled cucumber. Pickling is the process of preserving or extending the shelf life of food by either anaerobic fermentation in brine or immersion in vinegar.
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