Galvanized vs Cadmium Zinc Plating - NFPA (fire) Code Issues
网页2007年1月30日 · In the links given by cdafd, the comparison is with electroplated zinc -- typically much thinner than galvanized. In Phoenix, galvanized life indoors may be 300 years vs. 50 for cadmium. But, the major problem with cadmium is toxicity -- it is already banned from automobiles, electronics & government proects (except for a few critical ...
Torque For Plated Hardware:More or Less? - Eng-Tips
网页2004年11月1日 · An argument has erupted as to the correct installation torque for zinc and cad plated hardware as compared to plain clean steel hardware; our joint assy torque calculations are based on "K" factors suggested by Shigley which shows zinc or cad plating factors to be significantly lower than nonplated steel i.e., 0.2 and 0.16 (plated) versus 0.3 ...
Cadmium Plated AN4 Bolts vs CRES AN4C Bolts - Eng-Tips
网页2011年7月13日 · Recently an aircraft manufacturer issued a service bulletin advising the replacement of two AN4C bolts with two AN4 bolts, saying the cadmium plated alloy steel is stronger than the stainless steel AN4C bolts. It seems only way this could be true is if it is known that all cadmium plated AN bolts were much stronger than the minimum 125 kpsi ...
Cadmium plating of A325 bolts - Eng-Tips
网页2010年9月28日 · It is a restricted substance for many applications and is being replaced for fastener usage by many end users with many different coatings. ASTM A 325 usually is specified plain or zinc coated (hot dipped galvanized, mechanical galvanized, inorganic Zn). You can learn more about specifying these types of fasteners here:
Cadmium plated bolt vs Sodium Hypochlorite? - Eng-Tips
网页2012年11月20日 · Cadmium plated bolts don't last long in exterior environments. Their use should be restricted to protected indoor locations. Cadmium plated bolts are the cheap option. Galvanized bolts will last a long time, but for sodium hypochlorite, stainless steel is the better option.
Cadmium plated hardware used on Titanium parts... - Eng-Tips
网页2012年10月26日 · Cadmium plated clamps, tools, fixtures, and jigs shall not be used for fabrication or assembly of titanium components or structures. 5.4.3.2.1 Limitation on use of protective metallic coatings. Cadmium shall not be used on functional fuel systems components that can come into contact with fuel during operation of the aircraft.
Zinc Vs.Aluminum - Corrosion engineering - Eng-Tips
网页2009年1月23日 · In your condition apparently Aluminum are larger than zinc-plated area there so applying same coat to both side will help. zinc will corrode in contact with aluminum. if you have a look at a galvanic chart you'll see that the zinc is anodic vs aluminum. the amount of corrosion is a function of the area effect but also of the type of atmosphere..
Mechanical engineering general discussion - Eng-Tips
网页2015年5月7日 · Most zinc electroplating is around 0.0002 to 0.0003. Barrel plating of fasteners is done very commonly, and rarely causes dimensional issues. It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all. You are correct, it should be 0.0002" (0.005 mm).
galvanized steel vs zinc plated steel - Mechanical ... - Eng-Tips
网页2003年1月27日 · RE: galvanized steel vs zinc plated steel evelrod (Automotive) 27 Jan 03 22:10 Electroplating is pretty and yields a nice finish that is acceptable in items that are exposed to the elements when given additional protection, such as painting, etc. Hot dipped is a stand alone protection that is almost universally used where exposure is constant ...
Cadmium Plated Bolts - Structural engineering general discussion
网页2006年8月24日 · Cadmium plating resists corrosion better in most, real-world applications. However, it is frowned upon for environmental reasons. In terms of bolting, corroded zinc-plated bolts often snap when trying to undo nuts that are seized due to formation of a voluminous white corrosion product (ZnO + Zn(OH) 2 …