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 chemical makeup of the plating solution and the use of the solution can affect the porosity and corrosion resistance of the deposit. Please first log in with a verified email before subscribing to alerts. Subscription pricing is determined by: A number in parentheses indicates the year of last reapproval. After 3 min, apply a solution of potassium ferrocyanide prepared by dissolving 1 g of potassium ferrocyanide and 1.
This standard has been approved for use by agencies of the Department of Defense. 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.
Matrix effect due to the distribution of phosphorus in layers of the coating also effect the measurement accuracy and require that calibration standards be made under the same conditions as the production process. The phosphorus content of the coating must be known to calculate the thickness of the deposit.
An example is leaded steel which may exhibit liquid or solid embrittlement b7333-97 heat treatment. For each of the three axtm complete the following steps: A superscript epsilon e indicates an editorial change since the last revision or reapproval.
A g load is recommended. The following analysis wavelength lines have been used with minimum interference to determine the alloy.
They are used on beryllium and titanium parts for low stress properties. 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 sequence. The appearance of brown spots after 2 min indicate pores. The chemical and physical properties of the deposit vary primarily with its phosphorus content and subsequent heat treatment.
The location of rack or wire marks in the coating shall be agreed upon between the producer and purchaser. Current edition approved B7733-97 10, Individual alloys should be tested for maximum hardness attainable, especially for conditions of lower temperatures and longer times. NOTE 17—Appropriate test specimens are strips approximately 25 to 50 mm wide, to mm long and 3 to 6 mm thick.
The coating shall meet a maximum wear rate which is specied by the purchaser and agreed to by the producer. Guide B provides a large number of plans atsm also gives guidance on the selection of a plan.
Last previous edition B — 90 b733-97 For Class 2 coatings, the microhardness shall equal or exceed a minimum of HK or equivalent Vickers see 4. The conversion of Vickers to Knoop using Tables E is not recommended. Conversions of Vickers or Knoop hardness number to Rockwell C is not recommended.
The instrument must be calibrated with standards having the same composition as the coating. NOTE 10—Usually, when a collection of coated parts the inspection lot 8.
ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
NOTE 4—The purchaser should furnish separate test specimens or coupons of the asm metal for test purposes to be plated concurrently with the articles to be plated see 8. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Avoid rapid heating and cooling of plated parts. The inspection lot is then classied as complying or b733–97 complying with the requirements based on the results of the inspection sample. In the case of dissatisfaction occurs with the results of a test, the producer may make a claim for a hearing.
For example, coating with a test result for phosphorus of 9. The tests for these qualication requirements shall be performed monthly or more frequently. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
After coating and if specied, the part shall not exceed maximum dimension on signicant surface see section 5.
When Guide B is specied, the purchaser and producer need to agree on the plan to be used. The rhombic Knoop indenter gives higher hardness readings than the square-base pyramidal Vickers b733-7 indenter for to g loads, see Ref 6. These aztm are used in applications requiring abrasion and wear resistance.
As the voice of the U. Fine cracks in the coating on the tension side of the bend are not an indication of poor adhesion.
The producer shall not be responsible for coatings defects resulting from surface conditions of the metal, if these conditions have been brought to the attention of the purchaser.
If the document is revised or amended, you will be notified by email. The weight percent of phosphorus shall be in the range designated by type classication see axtm. NOTE 16—This method is only recommended for deposits in the as-plated condition.
Already Subscribed to this document. NOTE 11—The autocatalytic nickel process is dynamic and a daily sampling is recommended. Your Alert Profile b733–97 the documents that will be monitored. The test method, the duration of the test, and number of allowable spots per unit area shall be specied see section 5.