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 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 the ASTM Committee on Standards, at the address shown below. 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 part and pretreatment processing b733-9.
The weight percent of phosphorus shall be in the range designated by type classication see 4. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
If an alternate test is specied it shall be agreed upon between the producer and the purchaser. 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 heat. The instrument shall be calibrated with deposits plated in the same solution under the same conditions on magnetic steel.
Careful selection of the pre and post heat treatments are recommended. Rounding of the test results due to the precision of the limits provides for an effective limit of 4. For Class 2 coatings, the microhardness shall equal or exceed a minimum of HK or equivalent Vickers see 4. The chemical and physical properties of the deposit vary primarily with its phosphorus content and subsequent heat treatment.
It will vary depending on loads, type of indenter, and operator. NOTE 7—The length of time to reach maximum hardness varies with the phosphorus content of the deposit. The last must yield a numerical value and certain statistical requirements must be met. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
The rhombic Knoop indenter gives higher hardness readings than the square-base pyramidal Vickers diamond indenter for to g loads, see Ref 6.
The corrosion resistance of the coating to a specic liquid medium can be determined by means of immersion tests see Practice G 31 or electrochemical test see Practices G 5 and G The hardness of CS wheels can change with time and can effect the reproducibility of asstm see Test Method D NOTE 5—Heat treatment of the base material may effect its metallurgical properties. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
If they do not, Test Method B identies the plan to be used. This standard has been approved b7733-97 use by agencies of the Department of Defense. If the document is revised or amended, you will be notified by email.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. Specication B may be consulted for a list b7339-7 post treatments that are widely used.
The chemical makeup of the plating solution and the use of the solution can affect the porosity and corrosion resistance of the deposit. Three standards Test Method BGuide Band Test Method B contain sampling plans that are designed for the sampling inspection of coatings. For Coatings requiring alloy analysis and corrosion testing weekly sampling should be considered as an option. Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining.
ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
Please first verify your email before subscribing to alerts. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. NOTE 4—The purchaser should furnish separate test specimens or coupons of the basis metal for test purposes to be plated concurrently with the articles to be plated see 8. The coating is examined for blistering or other evidence of poor adhesion at 43 magnication. For example, coating with a test result for phosphorus of 9.
The conversion of Vickers to Knoop using Tables E is not recommended.
Current edition approved July 10, In the case of dissatisfaction occurs with the results of a test, the producer may make a claim for a hearing. Subscription pricing is determined by: An example is leaded steel which may exhibit liquid or solid embrittlement after heat treatment.
Any red aatm remaining indicate pores. NOTE 13—Eddy-current type instruments give erratic measurements due to variations in conductivity of the coatings with changes in phosphorus content. Any such defects on signicant surfaces shall be brought to the attention of the purchaser before plating.
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 satm. Test Method B contains four sampling b73-97, three for use with tests that are nondestructive and one for use with tests that are destructive. Insertion of a sharp probe at the interface of the coating and basis metal to determine the adhesion is suggested. Avoid rapid heating and cooling of plated parts.
NOTE 11—The autocatalytic nickel process is dynamic and a daily sampling is recommended. Report the mean and standard deviation for the coating. They are used on beryllium and titanium parts for low stress properties. The appearance of brown spots after 2 min indicate pores. For maximum accuracy, a minimum coating thickness of 75 m is recommended. The use of a statistical regimen to establish the control limits and frequency of analysis may be employed to ensure quality deposits are produced.
Careful attention to the selection of TYPE will insure optimum performance of the deposit in the intended application. The coating shall meet a maximum wear rate which is specied by the purchaser and agreed to by the producer.