ASTM_B() – Designation: B – 91 (Reapproved ) and Inorganic Coatings2 B Guide for Autocatalytic (Electroless). ASTM-B, ASTM-B, Mil-CE. Services. Home · Electroless Nickel Plating · Copper Plating · Tin Plating · Silver Plating · Gold Plating · Line. astm b pdf astm b ()e1 Standard Practice for Porosity in Gold and Palladium Alloy Coatings on Metal Substrates by Vapors of Sodium Hypochlorite .
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NOTE 3—Microscopic metallographic sectioning is dependent on the sample preparation. The stress relief heat treatment can reduce the hardness of some alloys and should therefore be reviewed by all parties before processing see 5.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address atm below.
Exposure b6569-1 the parts to hydrogen sources will generally induce the condition.
If they do not, Test Method B identi? In the sstm of dissatisfaction with the results of a test, the producer may make a claim for a rehearing. From the results of the analysis calculate a fraction of the boron or alloying element divided by the total of boron, nickel, and alloying element.
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The test must yield a numerical value and certain statistical requirements must be met. Current satm approved Sept. Care should be taken to control the humidity between tests as recommended by the equipment manufacturer. Rejection shall be reported to the v656-91 promptly in writing. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Astm b656-91 pdf
The determination of mass percent boron content may be accomplished by an appropriate analytical method such atm atomic absorption spectroscopy. Last previous edition approved 6b56-91 as B — 91 The inspection lot is then classi?
A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. Test Method BGuide Band Method B contain sampling plans asm are designed for the sampling inspection of coatings.
If they do not, Method B identi? These solutions contain either an alkylamineborane or sodium borohydride as a reducing agent, a source of nickel ions, a buffer, complexant, and control chemicals. Guide B provides a large number of plans and also gives guidance on the selection of a plan.
Electroless Nickel |
Calculate the thickness from the increase in mass, surface area, and density of the coating. The procedure is known as sampling inspection. It can only be used asgm coatings of known boron content. Analyze the solution for nickel at A superscript epsilon e indicates an editorial change since the last revision or reapproval. B — 91 Thin coatings of this type provide bondability and solderability on electronic components such as lead frames, electrical contacts, and headers.
For each of the three specimens follow X2. Care must be exercised whenever high strength steel is processed to ensure minimal exposure and timely relief treatment.
The results should be averaged without the? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The post treatment steps are designed to reduce the potential for hydrogen embrittlement, increase the adhesion of the coating to the substrate, improve the fatigue properties of the part sand increase the wear resistance and hardness of the coating: The size of the sample and the criteria ast, compliance are determined by the application of statistics.
Imperfections in the surface of the basis material including scratches, porosity, g656-91, inclusions, roll and die marks, lap crack, burrs, cold shuts, and surface roughness that could adversely affect the coating should be brought to the attention of the purchaser prior to processing see 7.
This technique measures the mass per unit area of the coating applied over the substrate and is displayed as thickness. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
To reface the wheels use CS discs. Originally approved in