Talk:Chrome plating
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Hard chromium layers (over 10 microns)can be used in various applications and consequently subject to different types of quality requirements. Hard chromium layers of hard rods of hydraulic cylinders are tested on corrosion resistance in salt spray cabinets. Because these are destructive tests, only representative sample material can be tested. The salt spray solutions and the conditions in the cabinet are normed as well as the evaluation of the result after the test. The duration of the test is depending the agressivity of the test and the the general expectation the industry has developed for this type of materials.
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[edit] Tone + possible copyvio
Quality requirements
"Chrome plate shall be uniform in thickness on all surfaces ..."
(1) The prescriptive tone of this seems highly inappropriate for an encyclopedia article.
(2) It's "obviously" (I could be wrong) taken from somewhere, and needs a cite or to be removed as a copyvio.
- This is standard and can be found appended to every drawing and work order for chrome plate in any of the industries that calls for chrome plate. However as you say the tone is a bit prescriptive, I will reword it later to-day or find some generaly avalable source to reference it. --DV8 2XL 17:13, 12 February 2006 (UTC)
[edit] Application of Chrome
This article could be more useful if it had some description for laypersons regarding the way chrome is applied to surfaces & explination of that to which all the technical terms refer.
[edit] Chrome and under metals -
Chrome uses various under plating to base metals. Two come to mind.
1. The quoted Nickel - which gives Chrome a blue tint. "Cold Chrome or Cold Steel" 2. A warmer and more typical undercoat is Copper. The pink color warms up Chrome.
If getting something chromed - consider the placement and use - talk to the shop expert.
72.26.8.143 21:59, 6 February 2007 (UTC)
[edit] from plater/chemist
0. we strip the existing plating off the part you bring in. If you don't do parts 1 & 2 right you can peel the cracked chrome off with your fingernails. With Copper and Nickel, the best result is to use a strike bath for adhesion and different bath for strength. 1. standard procedure is alkaline copper (cyanide) on steel/iron because nickel doesn't plate well on iron. 2. Acid nickel over the copper. Needed for underlying hardness and corrosion resistance. 3. Acid chrome. Microscopically peppered with micron sized holes to base metal nickel which together with thin layer of Cr2O3 provides the corrosion resistance of chrome plating. Note that Cr(+6) has poor throwing properties, that is parts or protrusions closer to the anodes get more chrome and holes and details less. 4. Acid chrome plating is dependent on a "slime layer" containing Cr(+2) that is critical, formed in the initial start of current. 5. Cr(+3) plating isn't new or difficult and has much better throwing power and adhesion to base metals. Problem is matte finish. Great for corrosion resistant plate of small parts but more common zinc-nickel etc are shiny.
Shjacks45 06:19, 28 September 2007 (UTC)
