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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When Guide B is speci? The test is performed on a rotating plated panel that is abraded by two rotating rubber wheels. The inspection lot is then classi?
A test specimen or part, processed in a manner that duplicates the characteristics of production parts, shall be produced and used in these tests. Ask for rush delivery. 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: Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This standard has been approved for use by agencies of the Department of Defense. Government requirements, if any see Section Calculate the thickness from the increase in mass, surface area, and density of the coating.
These test methods require a density factor to calculate the thickness. The purchaser and producer may agree on the plan s to be used. If you feel that your comments have not received b656-991 fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
In the case of dissatisfaction with the results of a test, the producer may make a claim for a rehearing. B — 91 Reapproved Standard Speci? Analyze the solution for nickel at The instrument shall be calibrated with specimens having the same basis material and coating composition as the part s.
In Stock Need it fast? Report the percent boron and alloying element if present in the coating.
Electroless Nickel |
A superscript epsilon e indicates an editorial change since the last revision or reapproval. The variation b65-91 boron content also affects the quantity and structure of nickel boride precipitated during b66-91 treatment. This technique measures the mass per unit area of the coating applied over the substrate and is displayed as thickness. Ensure that the specimen is at the same temperature for each measurement and that the surface measured is smooth.
Report the percent boron and alloying elements if present in the coating. Report the mean and standard deviation for the coating and the humidity during testing.
For each of the three specimens follow X2. These solutions contain either an alkylamineborane or sodium borohydride as a reducing agent, a source of nickel ions, a buffer, complexant, and control chemicals. Method B contains several plans and also gives instructions for calculating plans to meet special needs.
Special Government Regulations The coating shall meet a maximum wear rate which is speci? 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. NOTE 2—The density of the coating will decrease as the mass percent boron in the coating increases.
For Type 1 coatings the density is approximately 8. The determination of mass percent boron b6556-91 may be accomplished by an aatm analytical method such as atomic absorption spectroscopy.
They are referenced for information only: Guide B provides a large number of plans and also gives guidance on the selection of a plan. Thin coatings of this type provide bondability and solderability on v656-91 components such as lead frames, electrical contacts, and headers.
The use of the beta backscatter method is restricted to basis metals that have an atomic number less than 18 or greater than Duration of the test is cycles and it can be extended to 25 cycles.
Astm b656-91 pdf
Shorter times and higher g656-91 can be used if the resulting loss of surface hardness is acceptable to the purchaser. Care should be taken to control the humidity between tests as recommended by the equipment manufacturer.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The results should be averaged without the? Test Method BGuide Band Method B contain sampling plans that are designed for the sampling inspection of coatings. Astm b pdf ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
The alloy produced shall be within the range speci? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Originally approved in A list of my favorite links seguridad radiologica pdf technical interview questions on java with answers pdf resolucion de pdf nuclear decommissioning waste management and environmental site remediation pdf los siete habitos de la gente altamente efectiva pdf introduction to algorithms anany levitin pdf ejercicios elongacion muscular pdf epub file to pdf converter online uso de la c y s pdf intoxicacion por alcohol tratamiento pdf o quadrante do fluxo de caixa pdf lightly row piano pdf andhra christava keerthanalu free download pdf karthika masam mahatyam pdf hegemoni barat dan globalisasi pdf contaminantes emergentes en el agua pdf journal of black studies pdf adobe pdf descargar atomic molecular and optical physics handbook pdf ad organum faciendum pdf.
Imperfections in the surface atm the basis material including scratches, porosity, pits, 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 adtm the purchaser prior to processing see 7.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. In the as-plated condition the deposit consists of a predominantly amorphous mixture of nickel and boron with a hardness of about HKN. Rejection shall be reported to the producer promptly in writing. The wear rate shall be speci?
The stress relief heat treatment can reduce the hardness of some alloys and should therefore be reviewed by all parties before processing see 5.