ASTM B656-91 PDF


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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Method B can be used only for coating requirements that have a numerical limit, such as coating thickness. Special Government Regulations Current edition approved Sept.

This standard is subject to revision at any time by the b6569-1 technical committee and must be reviewed every? The wheels shall be loaded with g with the vacuum on high for the entire test. Report the mean and standard deviation for the coating and the humidity during testing. The panel is weighed before and after each cycles for weight loss determination. 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 awtm increases. These test methods require a density factor to calculate the thickness. NOTE 3—Microscopic metallographic sectioning is dependent on the sample preparation. This technique measures the mass per unit area of the asgm applied over the substrate and is displayed as thickness. This standard has been approved for use by agencies of the Department of Defense.

They are referenced for information only: Imperfections in the surface of the basis material including scratches, porosity, pits, inclusions, roll and die marks, lap aastm, 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. A number in parentheses indicates the year of last reapproval. Materials and Manufacture 6.


When Guide B is speci? Coatings that show imperfections may be rejected.

Astm b656-91 pdf

B — 91 Reapproved Standard Speci? In the as-plated condition the deposit consists of a predominantly amorphous mixture of nickel and boron with a hardness of about HKN. Ask for rush delivery. For each of the three specimens follow X2. NOTE 4—Usually, when a collection of coated parts the inspection lot; see 9.

Care should be taken to control the humidity between tests as recommended by the equipment manufacturer. 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.

Calculate the thickness from the increase in mass, surface area, and density of the coating. The use b66-91 the beta backscatter method is restricted to basis metals that have an b56-91 number less than 18 or greater than The determination of mass percent boron content may be accomplished by an appropriate analytical method such as atomic absorption spectroscopy. B — 91 Their columnar structure, however, is bene? A test specimen or part, processed in a manner that duplicates the characteristics of production parts, shall be produced and used in these tests.

Guide B provides a large number of plans and also gives guidance on the selection of a plan. The test is performed on a rotating plated panel that is abraded by two rotating rubber wheels. It can only be used for coatings of known boron content. Shorter times and higher temperature can be used if the resulting loss of surface hardness is acceptable to the purchaser. Last previous edition approved in as B — 91 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 shown below.


A superscript epsilon e indicates an editorial change since the last revision or reapproval. Method B contains several plans and also gives instructions for calculating plans to meet special needs. Using a asym Vernier microscope, examine the thickness of the deposit and average over 10 readings using Test Method B The size of the sample and the criteria of compliance are determined by the application of statistics.

Government requirements, if b656-911 see Section Rejection shall be reported to the producer promptly in writing. 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.

The aetm must yield a numerical value and certain statistical requirements must be met. The coating shall meet a maximum wear rate which is speci?

In the case of dissatisfaction with the results of a test, the producer may make a claim for a rehearing. In Stock Need it fast?

Electroless Nickel |

Thin coatings of this type provide b56-91 and solderability on electronic components such as lead frames, electrical contacts, and headers. For Type 1 coatings the density is approximately 8.

Rejection and Rehearing Ensure that the specimen is at the same temperature for each measurement and that the surface measured is smooth. The variation of boron content also affects the quantity and structure of nickel boride precipitated during heat treatment. To maintain solderability, these coatings are generally not heat treated.

Exposure of the parts to hydrogen sources astmm generally induce the condition.