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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Coatings that show imperfections may be satm. Ensure that the specimen is at the same temperature for each measurement and that the surface measured is smooth. 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. NOTE 3—Microscopic metallographic sectioning is dependent on the sample preparation.
The determination of mass percent boron content may be accomplished by an appropriate analytical method such as atomic absorption spectroscopy. Each lot of part s shall be sampled with the recommended procedure described in Section 9 of this speci?
Their columnar structure, however, is bene? To maintain solderability, these coatings are generally not heat treated.
Method B contains several plans and also gives instructions for calculating plans to meet special needs. These test methods require a density factor to calculate the thickness.
Duration of the test is cycles and it can be extended to 25 cycles. It can only be used for coatings of known boron content. This standard does not purport to address the safety problems associated with its use.
NOTE 2—The density of the coating will decrease as the mass percent boron in the coating increases. 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 test must yield a numerical value and certain statistical requirements must be met. B — 91 Ask for rush delivery. 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.
Astm b656-91 pdf
Shorter times and higher temperature can be used if the resulting loss of surface hardness is acceptable to the purchaser. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. In the as-plated condition the deposit consists of a predominantly amorphous mixture of nickel and boron with a hardness of about HKN. The panel is weighed before and after each cycles for weight loss determination. The procedure is known as sampling inspection.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Electroless Nickel |
Your comments will receive careful consideration at a meeting of asgm responsible technical committee, which you may attend. A number in parentheses indicates the year of last zstm. NOTE 4—Usually, when a collection of coated parts the inspection lot; see 9. Asgm they do not, Method B identi? The wheels shall be loaded with g with the vacuum on high for the entire test. Guide B provides a large number of plans and also gives guidance on the selection of a plan.
Exposure of the parts to hydrogen sources will generally induce the condition. Method B can be used only for coating requirements that have a numerical limit, such as coating thickness.
Analyze the solution for nickel at Calculate the thickness from the increase in mass, surface area, and density of the coating.
A test specimen or part, processed in a manner that duplicates the characteristics of production parts, shall be produced and used in these tests. Imperfections in the surface of 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 of the purchaser prior to processing see 7. These solutions contain either an alkylamineborane or sodium borohydride as a reducing agent, a source of nickel ions, a buffer, complexant, and control chemicals.
The results should be b656-9 without the? 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: This standard is subject to revision at any time by the responsible technical committee and 6b56-91 be reviewed every?
Rejection shall be reported to the producer promptly in writing. To reface the wheels use CS discs. The use of the beta backscatter method is restricted to basis metals that have an atomic number less than 18 or greater than The test is performed on a rotating plated panel that is abraded by two rotating rubber wheels.
This standard has been approved for use by agencies of the Department of Defense. In Stock Need it fast? The inspection lot ast, then classi? The size of the sample and the criteria of compliance are determined by the application of statistics. Test Method BGuide Band Method B contain sampling plans that are designed for the sampling inspection of coatings. They are nondestructive testing methods for detecting discontinuities that are open to the surface such as cracks, seams, laps, cold shuts, laminations, through leaks, or lack of fusion and are applicable to inprocess, final, and maintenance examination.
B — 91 Reapproved Standard Speci? The coating shall meet a maximum wear rate which is speci? The wear rate shall be speci? Thin coatings of this type provide bondability and solderability on electronic components such as lead frames, electrical contacts, and headers.