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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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Care should be taken to control the humidity between tests as ast, by the equipment manufacturer. 6b56-91 comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

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 test is performed on a rotating plated panel that is abraded by two rotating rubber wheels.

The instrument shall be calibrated with specimens having the same basis material and coating composition as the part s.

Individual reprints single or multiple copies of this standard may be b566-91 by contacting ASTM at the above address or at phonefaxor service astm.

The inspection lot is then classi? Shorter times and higher temperature can be used if the resulting loss of surface hardness is acceptable to the purchaser. Care must be exercised whenever high strength steel is processed to ensure minimal exposure and timely relief treatment.

Astm b656-91 pdf

In the b6656-91 condition the deposit consists of a predominantly amorphous mixture of nickel and boron with a hardness of about HKN. Ask for rush delivery. B — 91 For Type 1 coatings the density is approximately 8. Calculate the thickness from the increase in mass, surface area, and density of the coating.


Duration of the test is cycles and it can be extended to 25 cycles. NOTE 3—Microscopic metallographic sectioning is dependent on the sample preparation. NOTE 4—Usually, when a collection of coated parts the inspection lot; see 9. A number in parentheses indicates the year wstm last reapproval.

Astm b pdf To reface the wheels use CS discs. Each lot of part s shall be sampled with the recommended procedure described in Section 9 of this speci?

Electroless Nickel |

It can only be used for coatings of known boron content. Test Method BGuide Band Method B contain sampling plans that are designed for the sampling inspection of coatings.

Last previous edition approved in 6b56-91 B — 91 The purchaser and producer may agree on the plan s to be used. The test must yield a numerical value and certain statistical requirements must be met. The size of the sample and the criteria of compliance are determined by the application aastm statistics.

Materials and Manufacture 6.

Government requirements, if any see Section Exposure of the parts to hydrogen sources will generally induce the condition. The use of the beta backscatter method is restricted to basis metals that have an atomic number less than 18 or greater than In Stock Need it fast?

B — 91 Reapproved Standard Speci? NOTE 2—The density of the coating will decrease as the mass percent boron in the coating increases. Test Method B contains four sampling plans, three for use with tests that are nondestructive and one for use with tests that are destructive. The panel is weighed before and after each cycles for weight loss determination.


When Guide B is speci? In the case of dissatisfaction with the results of a test, the producer may make a claim for a rehearing. 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 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: Method B can be used only for coating requirements that have a numerical limit, such as coating thickness. These solutions contain either an alkylamineborane or sodium borohydride as a reducing agent, a source of nickel ions, a buffer, complexant, and control chemicals.

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