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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NOTE 17—Appropriate test specimens are strips approximately 25 to 50 mm wide, to mm long and 3 to 6 mm thick. For Class 2 coatings, b73-97 microhardness shall equal or exceed a minimum of HK or equivalent Vickers see 4. Specication B may be consulted for a list of post treatments that are widely used.
Please first verify your email before subscribing to alerts. These coatings are used in electronic applications providing solderability, bondability, increased asstm conductivity, and resistance to strong alkali solutions. This standard has been approved for use by agencies of the Department of Defense.
The appearance of brown spots after 2 min indicate pores. It is characterized by industrial atmosphere exposure on steel substrates in dry or oiled environments. The coating shall meet a maximum wear rate which is specied by the purchaser and agreed to by the producer.
Three standards Test Method BGuide Band Test Method B contain sampling plans that are designed for the sampling inspection of coatings. Continue to boil the water for 30 min.
The wheels shall be loaded with g with a vacuum on high for the entire test. The surface of the coating shall be cleaned prior to testing see Note It will vary depending on loads, type of indenter, and operator. When required, one of the following tests can be used on the plated part or specimen.
When specied in the purchase order or contract, a report of the test results shall be furnished. Make sure that the surfaces awtm are smooth, clean, and dry. After coating and if specied, the part shall not exceed maximum dimension on signicant surface see section 5.
Guide Adtm provides a large number of plans and also gives guidance on the selection of a plan. The test is performed by rotating a plated panel under rotating rubber wheels and weighing the panel after each cycles for weight loss.
If you feel that your comments have not received a fair hearing you should make your views known to asmt ASTM Committee on Standards, at the address shown below. Coatings with phosphorus contents greater than atsm You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. Any such defects on signicant surfaces shall be brought to the attention of the purchaser before plating.
This standard is not included in any packages. B73-97 instrument must be calibrated with standards having the same composition as the coating. NOTE 5—Heat treatment of the base material may effect its metallurgical properties. The program involved plating Report the mean and standard deviation for the coating.
Use the test methods described in 9. Test specimens are available from Taber. Add to Alert PDF. Base metal condition, undercoats, surface preparation, and post processing all have a signicant effect on the performance and should be given careful consideration when designing the b7333-97 and pretreatment processing sequence.
Any red spots remaining indicate pores. These differences also effect non-destructive thickness testing by X-Ray and magnetic means. Already Subscribed to this document. After 3 min, apply a solution of potassium ferrocyanide prepared by dissolving 1 g of potassium ferrocyanide and 1.
ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
Test Method B can be used only for coating requirements that have a numerical limit, such as coating thickness. B — 97 Standard Specication for Aatm Electroless Nickel-Phosphorus Coatings on Metal 1 This standard is issued under the xed designation B ; the number immediately following the designation indicates the year of original adoption b733-9, in the case of revision, the year of last revision. Individual v733-97 single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
NOTE 7—The length of time to reach maximum hardness varies with the phosphorus content of the deposit. NOTE 14—To protect the edges, electroplate the specimens with a minimum of 5 m of nickel or copper prior to cross sectioning.
NOTE 19—Aerated water is prepared by bubbling clean compressed air through distilled water by means of a glass diffusion disk at room temperature for 12 h. This specification covers requirements for autocatalytic electroless nickel-phosphorus coatings applied from aqueous solutions to metallic products for engineering functional uses.
They are used on beryllium and titanium parts for low stress properties. Materials and Manufacture 6. The coating is examined for blistering or other evidence of poor adhesion at 43 magnication. Test Method B contains several plans and also gives instructions for calculating plans to meet special needs.