ASTM B Standard Specification for Autocatalytic (Electroless) Nickel- Phosphorus Coatings on Metal. This specification covers requirements for. A S T M BENGL W Ob T A U 4Tb – m AMERICAN origioauy published as B direct responsibility of Subcommittee B Advanced Plating Technologies, a Milwaukee, Wisconsin company, provides electroless nickel plating per MIL-C, ASTM B and AMS as well as.
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The conversion of Vickers to Knoop using Tables E is not recommended.
The coating is examined for blistering or other evidence of poor adhesion at 43 magnication. An example is leaded steel which may exhibit liquid or solid embrittlement after heat treatment. A g load is recommended. Report the mean and standard deviation for the coating. NOTE 11—The autocatalytic nickel process is dynamic and a daily sampling is recommended. Test Method B contains four sampling plans, three for use with tests that are nondestructive and one for use with tests that are destructive.
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ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
The pH of the aerated water should be 6. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Any such defects on signicant surfaces shall be brought to the attention of the purchaser before plating. Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining. If the document is revised or amended, you will be notified by email. As the voice of the U. The location of rack or wire marks atsm the coating shall be agreed upon between the producer and purchaser.
A suitable method shall activate the surface and remove oxide and foreign materials, which may cause poor adhesion and coating porosity. For Class 2 coatings, the microhardness shall equal or exceed a minimum of HK or equivalent Vickers see 4.
Coatings with phosphorus contents greater than When specied in the purchase order or contract, a report of the test results shall be furnished. Coatings that show imperfections may be rejected. Originally published as B — To reface the wheels use CS discs from Taber. The rhombic Knoop indenter gives higher hardness readings than the square-base pyramidal Vickers diamond indenter for to g loads, see Ref 6.
Then remove the part, air dry, and examine for rust spots, which indicate pores. NOTE 14—To protect the edges, electroplate the specimens with a minimum of 5 m of nickel or copper prior to cross sectioning. A number in parentheses indicates the year of last reapproval.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Three standards Test Method BB7333-97 Band Test Method B contain sampling plans that are designed for the sampling inspection of coatings. Proceed to Checkout Continue Shopping.
For Coatings requiring alloy analysis and corrosion testing weekly sampling should be considered as an option. NOTE 13—Eddy-current type instruments give erratic measurements due to variations in conductivity of the coatings with changes in phosphorus content.
When required, one of the following tests can be used on the plated part or specimen. The instrument must be calibrated with standards having the same composition as the coating. These coatings are used in applications requiring abrasion and wear resistance.
The wear rate shall be specied by the purchaser and agreed to by the producer. You may delete a document from your Alert Profile bb733-97 any time.
Any red spots remaining indicate pores. The precision and bias requirements will vary for each type of axtm.