ASTM Standards: B Practice for Operating Salt Spray (Fog) Apparatus2. B Guide for Engineering Chromium Electroplating3. B Practice for. Endorsed by AmericanDesignation: B – 01 (Reapproved )e1. ASTM B/BM() Standard Guide for Engineering Chromium Electroplating Scope
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This is a very dangerous exothermic reaction.
Standard Guide for Engineering Chromium Electroplating
The preceding solution should, of course, be handled with all the caution required of standard chromium plating baths. The required surface smoothness may be obtained by suitable chemical, mechanical, or electrochemical procedures. Combining values from the two systems may result in non-conformance with the standard. With very great agitation, the highest atsm density shown is possible with a concomitant decrease in the plating time.
ASTM B – 01 Standard Guide for Engineering Chromium Electroplating
This guide provides information on the deposition of engineering chromium by electroplating. Guide B lists bakes appropriate for the tensile strength of the electroplated part and should be consulted for post-electroplating baking procedures and classes. The design of racks for chromium electroplating on the various base metals previously mentioned for functional use should provide for the xstm to the greatest possible extent.
There does not have to be rinsing before transfer to the plating tank, but parts should be thoroughly drained to prevent spillage of the etching solution. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
Some stainless steels benet from a Woods nickel strike prior to chromium electroplating. Depending upon the thickness of the electrodeposit and the smoothness required of the electrodeposit, grinding of the electrodeposit may be required.
Please first verify your email before subscribing to alerts. The sulfate anion SO42— is added to the bath as sulfuric acid. B — 01 Endorsed by American Electroplaters’ Society Endorsed by National Association of Metal Finishers Standard Guide for Engineering Chromium Electroplating1 This standard is issued under the xed designation B ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
The calculated amount should be diluted by adding it to deionized water prior to adding it to the bath. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
ASTM B177/B177M – 11(2017)
Nevertheless, if the procedures cited in the appropriate references are followed, the bond strength is such that grinding and honing can be conducted without delamination of the coating. In all cases, the duration of the bake shall commence from the time at which the whole of each part attains the specied temperature.
When conditions are especially unfavorable, denite steps must be taken to meet this important requirement, including storage in a noncorrosive environment, or the use of a suitable coating to exclude air and moisture. Historical Version s – view previous versions of standard.
The main difficulty with these materials when chromium plating is polarization of the nickel alloy surface prior to plating which results in deactivation of the material and skip plating. Originally published as B — Engineering chromium may be plated directly to the surface of a commonly used engineering metals such as aluminum, nickel alloys, cast iron, steels, copper, copper alloys, and titanium.
Any mechanical operations that can result in grinding checks or glazing of the metal are detrimental and should be eliminated.
X-Ray uorescence qstm be used to measure very thin chromium deposits of 1 to 20 m 3 in. If a nondestructive method is required, magnetic induction methods in accordance with Test Method B are suitable for chromium over magnetic substrates. Consult Specication B for maximum length of time permitted between plating and baking operations.
If the anode contains little or no lead, the reoxidation of trivalent chromium to the hexavalent state will not take place or will be seriously impaired, which will lead to trivalent buildup in the plating solution and poor results.
Analytical control of the silicouoride is more difficult than the other components, but ion selective methods are satisfactory. This acid also requires great care in handling.
If grinding is very aggressive, removing a large amount of metal per grinding pass and generating high localized temperatures, the chromium is apt to develop a network of macrocracks visible to the naked eye.
However, it tends to form great quantities of scale that may fall off on the work and cause pitting or roughness. This process is much simpler than that in 6. This is normally used on highly nished steel requiring only a thin chromium deposit as its use may result in less adhesion than other procedures and in hydrogen embrittlement of the steel. These atsm produce microcracked deposits which may be an advantage in some deposits.
Chemical lead is also satisfactory where hardness and rigidity are not important.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Steel or ferrous parts to be plated are allowed to reach the bath temperature and electroplating is then commenced. Deoxidizing and Etching 6. If the document is revised or amended, you asfm be notified by email. This is sometimes sstm “functional” or “hard” chromium and is usually applied directly to the basis metal and is usually thicker than decorative deposits.
Subscription pricing is determined by: Standards Subsctiption may be the perfect solution. In operating these baths, it is essential that no sulfate be introduced into the bath.