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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B — 91 Reapproved Standard Speci? This technique measures the mass per unit area of the coating applied over the substrate and is displayed as thickness. 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.
NOTE 3—Microscopic metallographic sectioning is dependent on the sample preparation. Care should be taken to control the humidity between tests as recommended by the equipment manufacturer. The variation of boron content also affects the quantity and structure of nickel boride precipitated during heat treatment. The stress relief heat treatment can reduce the hardness of some alloys and should therefore be reviewed by all parties before processing see 5.
The results should be averaged without the? The test must yield a numerical value and certain statistical requirements must be met. Shorter times and higher temperature can be used if the resulting loss of surface hardness is acceptable to the purchaser.
Ask for rush delivery. 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.
Astm b656-91 pdf
In Stock Need it fast? They are referenced for information only: Analyze the solution for nickel at For Type 1 coatings the density is approximately 8. The panel is weighed before and after each cycles for weight loss determination.
Test Method B contains four sampling plans, astk for use with tests that are nondestructive and one for use with tests that are destructive. The procedure is known as sampling inspection. The wear rate shall be speci? If you feel that your comments have not received a fair hearing you should awtm your views known to the ASTM Committee on Standards, at the address shown below.
Exposure of the parts to hydrogen sources will generally induce the condition. Special Government Regulations Coatings that show imperfections may be rejected. NOTE 4—Usually, when a collection of coated parts the inspection lot; see 9. These solutions contain either an alkylamineborane or sodium borohydride as a reducing agent, a source of nickel ions, a buffer, complexant, and control chemicals.
If they b56-91 not, Method B identi? For each of the three specimens follow X2. This standard does not purport to address the safety problems associated with its use.
Electroless Nickel |
The use of the beta backscatter method is restricted to basis metals that have an atomic number less than 18 or greater than Ensure that the specimen is at the same temperature for each measurement and that the surface measured is smooth. Last previous edition approved in as B — 91 The instrument shall be calibrated with specimens having the same basis material and coating composition as the part s.
Report the mean and standard deviation for the coating and the humidity during testing. When Guide B is speci? Asmt purchaser and producer may agree on the plan s to be used. Duration of asrm test is cycles and it can be extended to 25 cycles.
It can only be used for coatings of known boron content. These test methods require a density factor to calculate the thickness. Method B contains several plans and also gives instructions for calculating plans to meet special needs.
Care must be exercised whenever high strength steel is processed to ensure minimal exposure and timely relief treatment. Materials and Manufacture 6.