What should be minimum coating thickness for zinc plating on mounting pan of electrical load centers? For some applications, designers may opt to use zinc-nickel plating instead of zinc plating for further corrosion resistance, the above table will not be applicable. "background": "#237afc" This page is provided for information only, it should not be considered advice and we cannot accept any responsibility or liability for your use of the information on this page. See our, Offices, domestic premises (excluding kitchens and bathrooms). Please email us if you would like advice on zinc plating thickness. of .152 mm. window.addEventListener("load", function(){ The customer has mentioned reduction in effective dia. Q. Dear all, The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful. What is a safe plating that should not cause binding in the threads for a #6 screw? A. Hi Manikandaprabu. A. Hi Gary. 5 µm for mild service The thickness of zinc plating that you should use depends on the environment that the component is in. The corrosion resistance of the zinc depends on two things: The protection from the zinc plating is proportional to the thickness of the zinc plating - so thicker zinc means more protection for the base metal. The concentration of cadmium must be less than 100 PPM or 0.01%. link to spec at Techstreet] correctly we should be allowed to go to class 3A gages to allow for the thread growth on external threads. Threaded holes should be tapped oversize to allow for the coating buildup, or masked to prevent coating. The answer will depend in large part on what average or minimum plating thickness you are specifying. Surfaces on which the specified thickness of deposit cannot readily be controlled, such as threads, holes, deep recesses, bases of angles, and similar areas, are … A. Hi, Syed. In the most corrosive environments, particularly those with a risk of salt spray, zinc plating alone will probably be insufficient. I need to zinc plate (and gold passivate) a screw of dia. Zinc Plating SIR, MY QUESTION IS WHAT IS THE THICKNESS OF ZINC ALKALINE ON THREAD BOLT? If there are no such standards, and this application is indoors in a relatively benign environment, then 5 µm (0.0002") minimum would be a good place to start because that's pretty much the commercial minimum. Q. Q. 25 µm for very severe service Concentrations of lead, mercury, poly-brominated Biphenyls (PBB) and polybrominated diphenyl ethers (PBDE), in any as deposited homogenous material must be less than 1000 PPM or 0.1%. A. note: The following threads also seem to offer good insight into thread allowances for plated parts: This page just gives general suggestions and our specialists will be able to provide more in-depth information. We have experienced substantial fallout on external threaded parts requiring zinc plating that do not pass after-plate thread ring gages. "button": { If the allowance of an #6-32 UNC-2B screw is .0008" and I use Fe/Zn 5ANS per ASTM F1941 I should be fine because 5 microns is t=.0002" and multiplied by 4 then the pitch diameter of the screw is increased by .0008". letter 2906 and E&OE. Alkaline zinc — This offers less plating efficiency than acid zinc and a slower electrodeposition rate, but it provides better thickness distribution and ductility Choosing the appropriate zinc plating procedure — After solution preparation, the parts are ready for plating. Thickness in each side of the part. ---- I have several concerns with doing this: the cost of new pre-plate gaging, the effect of .0005" plating thickness on the 60 deg. affil. If the finish is at a minimum .0002" is there a binding risk because the plating doesn't specify a max tolerance? Is my math correct or can I get by with Fe/Zn 8ANS per F1941? Now, what are you using as a nut? ASTM B633 [affil. Good luck. Ed. In the past we have attempted to produce threads to a undersize pitch diameter (less 4 times plating thickness) and use the 2A gages to check afterplate condition. }); elements_selector: "iframe" That doesn't strike me as unreasonable as long as there are no industry standards which you have agreed to meet which call for the thicker plating. Our current plating supplier is asking for us to loosen the tolerance to .0002"-.0005" stating that this is as good as the industry can provide. The normal zinc-plated coating is dull gray in color with a matte finish. & Install'nChemicals & Consumables Q. Hi, Good day, I am Manikandaprabu, We are using Boron steel with zinc plating and olive darb passivation for SELF TAPPING SCREW ST 4.2x13-C that is used in drain hose assembly of washing machine. How can I specify the plating; what is the standard I have to refer to? 13 µm for severe service Plating thickness is crucial for functional coatings since the thickness of the coating is proportional to its durability. window.cookieconsent.initialise({ Our preplate gages have been setup to allow for .0001-.00035" plate thickness. Actually the thickness of the zinc plating can be irrelevant because, although the zinc plating prevents red rust, it is the chromate conversion coating and any subsequent top coats that prevents the … We have experienced substantial fallout on external threaded parts requiring zinc plating that do not pass after-plate thread ring gages. I hope this helps Enrique. or. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. Zinc Plating is commonly used in a variety of industries, including industrial and defense. new LazyLoad({ is one of the better known standards which defines required thickness vs. service conditions: 8 µm for moderate service Q. "popup": { I am familiar with plating but not with IEEE [link is to specs at TechStreet] or NEMA [link is to specs at TechStreet] or other standards that might dictate plating thickness for this particular application. "background": "#fff", letter 122/11. If I'm reading SAE J476A [affil. Also, in special applications the thickness on the threads is considered that it affects 4 parts of the thread; the right hand side of the thread (crest), the left side of the same thread and the same happens on the other side of the fastener. If you need a product/service, please check these Directories: JobshopsCapital Equip. }, https://metalfinishingsltd.co.uk/articles/zinc-thickness-guidance The coating is entirely pure zinc, which has a hardness about one-third to one-half that of most steels. Thickness has almost no effect on the resistance to “white rust” because this involves the coating itself corroding. Thickness to reach 1 oz/ft 2. thread form, extensive print changes, and conflict with our existing customer prints. (adsbygoogle = window.adsbygoogle || []).push({}); Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. It is unusual to specify less than .0002" average plating thickness, so .0002"-.0005" doesn't sound at all unreasonable to me. A. Hi manoj. All rights reserved. Consult'g, Train'g, SoftwareEnvironmental Compliance. How Google uses data when you visit this site. by Herb Geduld A. Gary & Ted, This might sound as a very stupid comment, but we have encountered this problems in the past and some clients don't consider that the thickness of the deposit has to be counted double when considering a round diameter. })}); 60,000 Q&A topics -- Education, Aloha, & Fun, manufacturing engineer - Riyadh, Centeral, Saudi Arabia, -- this entry appended to this thread by editor in lieu of spawning a duplicative thread, ©1995-2020 finishing.com, Inc., Pine Beach, NJ, How Google uses data when you visit this site. There is no standard thickness which is irrespective of the application. BZ Applicable Industry Spec: ASTM B633, SC1 (5µm), Type III, Blue, Classification Numbers (ECCN, CAGE, DUNS, NAICS), CAMDS (China Automotive Material Data System), DFARS (Defense Federal Acquisition Supplement), IMDS (International Material Data System), ITAR (International Traffic In Arms Regulations), ODS General Statement (Ozone Depleting Substances), UL (Underwriter Laboratories Safety and Certification Organization – PEM Product Certifications), 3D Models (download or direct insert free on website), Employee Spotlight – Larry Zhang, New Product Applications Manager, Kunshan, China, DesignFax October 2019 – Trends in Fastening Technology: Smaller, Lighter, Easier to Install.

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