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.
|Published (Last):||11 October 2018|
|PDF File Size:||16.10 Mb|
|ePub File Size:||17.54 Mb|
|Price:||Free* [*Free Regsitration Required]|
B7339-7 size of the sample and the criteria of compliance are determined by the application of statistics. NOTE 16—This method is only recommended for deposits in the as-plated condition. The weight percent of phosphorus shall be in the range designated by type classication see 4. Materials and Manufacture 6. Use the test methods described in 9. Also, discoloration due to heat treatment shall not be cause for rejection unless special heat treatment atmosphere is specied see section 5.
NOTE 7—The length of time to reach maximum hardness varies with the phosphorus content of the b73-397. NOTE 12—Inductively coupled plasma techniques can determine the alloy to within 0.
NOTE 9—The thickness of the coating cannot be controlled satm blind or small diameter deep holes or where solution circulation is restricted.
The precision and bias requirements will vary for each type of test. The conversion of Vickers to Knoop using Tables E is not recommended.
A suitable method shall activate the surface and remove oxide and foreign materials, which may cause poor adhesion and coating porosity. The coating is examined for blistering or other evidence of poor adhesion at 43 magnication. The last must yield a numerical value and certain statistical requirements must be met.
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 surface of the coating shall be cleaned prior to testing see Note After rinsing and air drying, examine the part for blue spots, which form at pore sites.
This standard is not included in any packages. These coatings are used in applications requiring abrasion and wear resistance. If an alternate test is specied it shall be agreed upon between the producer and the purchaser. For example, coating with a test result for phosphorus of 9.
The inspection lot is then classied as complying or not complying with the requirements based on the results of the inspection sample. Coatings with phosphorus contents greater than 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.
Any such defects on signicant surfaces shall be brought to the attention of the purchaser before plating. They are used on beryllium and titanium parts for low stress properties. 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. B — 97 Standard Specication for Autocatalytic 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 or, in the case of revision, the year of last revision.
Individual alloys should be tested for maximum hardness attainable, especially for conditions of lower temperatures and longer times. After 4 min contact, apply glacial acetic acid until the violet color asfm. NOTE 17—Appropriate test specimens are strips approximately 25 to 50 mm wide, to mm long and 3 to 6 mm thick.
The tests for these qualication requirements shall be performed monthly or more frequently. The hardness of CS wheels can change with time and can effect the reproducibility of results see Test Method B733-977 Avoid rapid heating and cooling of plated parts.
For each of the three specimens complete the atm steps: Please first verify your email before subscribing to alerts. 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. Specication B may be consulted for a list of post treatments that are widely used. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.
Guide B provides a large number of plans and also gives guidance on the selection of a plan.
For Class 2 coatings, the microhardness shall equal or exceed a minimum of HK or equivalent Vickers see 4. Do not use gas containing hydrogen with high-strength steel parts.
This standard is also available to be included in Standards Subscriptions. The program involved plating H733-97 may delete a document from your Alert Profile at any time.
When specied in the purchase order or contract, a report of the test results shall be furnished. This standard has been approved for use by agencies of the Department of Defense.
Duration of the test is cycles and it can be extended to 25 cycles for more complete results.
ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
Conversions of Vickers or Knoop hardness number to Rockwell C is not recommended. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This specification covers requirements for autocatalytic electroless nickel-phosphorus coatings applied from aqueous solutions to metallic products for engineering functional uses.
The heat treatment temperature was considerably higher than typical processing and was chosento evaluate the formation of diffusion products of iron, nickel and phosphorus. The pH of the aerated water should be 6.