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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ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
Your Alert Profile lists the documents that will be monitored. In all cases, the duration of the heat treatment shall commence from the time at which the whole of each part attains the specied temperature. Apply heat to the beaker at such a rate that the water begins to boil in not less than 15 min, nor more than 20 min after the initial application of astn.
The size of the sample and the criteria of compliance are determined by the application of statistics. NOTE 11—The autocatalytic nickel process is dynamic and a daily sampling is recommended. Add to Alert PDF. The use of a statistical regimen to establish the control limits and frequency of analysis may be employed to ensure quality deposits are produced. Also, discoloration due to heat treatment shall not be cause for rejection unless special heat treatment atmosphere is specied see section 5.
Make sure that the surfaces measured are smooth, clean, and dry.
The pH of the aerated water should be 6. Report the mean and standard deviation for the coating. These differences also effect non-destructive thickness testing by X-Ray and magnetic means. The procedure is known as sampling inspection. The weight percent of phosphorus shall be in the range designated by type classication see 4. NOTE 9—The thickness of the coating cannot be controlled in blind or small diameter deep holes or where solution circulation is restricted.
Then remove the part, air dry, and examine for rust spots, which indicate pores. Careful selection of the pre and post heat treatments are recommended. Coatings that show imperfections may be rejected.
NOTE 2—The performance of the autocatalytic nickel coating depends to a large extent on the surface nish of the article to be plated and how it was pretreated. The location of rack or wire marks in the coating shall be agreed upon between the producer and purchaser. Additional requirements for internal stress, purity, and elongation may be necessary for some applications.
When specied in the purchase order or contract, a report of the test results shall be furnished. This specification covers requirements for autocatalytic electroless nickel-phosphorus coatings applied from aqueous solutions to metallic products for engineering functional uses.
Last previous edition B — 90 The instrument must be calibrated with standards having the same composition as the coating. Standards Subsctiption may be the perfect solution. An inspection lot shall be dened as a collection of coated parts which are of the same kind, that have been produced to the same specication, that have been coated by a single producer at one time or approximately the same time under essentially identical conditions, and that are submitted for acceptance or rejection as a group.
NOTE 10—Usually, when a collection of coated parts the inspection lot 8. Rough, non uniform surfaces require thicker coatings than smooth surfaces to achieve maximum corrosion resistance and minimum porosity. For example, coating with a test result for phosphorus of 9. Zstm wheels shall be loaded with g with a vacuum on high for the entire test.
Individual alloys should be tested for maximum hardness attainable, especially for conditions of lower temperatures and longer times. Fine cracks in the coating on the tension side of the bend are not an indication of poor adhesion. The coating shall meet a maximum wear rate which is specied by the purchaser and agreed to by the producer.
If they do adtm, Test Method B identies the plan to be used.
This standard does not purport to address all of the safety concerns, if any, associated with its use. NOTE 1—Due to the precision of some phosphorus analysis methods a deviation of 0. Coatings with phosphorus contents greater than Typical environments include light-load lubricated wear, indoor corrosion protection to prevent rusting, and for soldering and mild abrasive wear.
Use the test methods described in 9. 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 number in parentheses indicates the year of last reapproval. After 4 min contact, apply glacial acetic acid until the violet color disappears. The test is performed by rotating a plated panel under rotating rubber wheels and g733-97 the panel after each cycles for weight loss.