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 coating shall meet a maximum wear rate which is specied by the purchaser and agreed to by b733-977 producer. Insertion of a sharp probe at the interface of the coating and basis metal to determine the adhesion is suggested.
This standard is subject to revision at any time by the responsible technical committee and must ast, reviewed every ve years and if not revised, either reapproved or withdrawn.
For each of the three specimens complete the following steps: Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. It will vary depending on loads, type of indenter, and operator. Rejection aztm be reported to the producer promptly in writing.
Report the mean and standard deviation for the coating. The last must yield a numerical value and certain statistical requirements must be met. The precision and bias requirements will vary for each type of test. 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.
The hardness of CS wheels can change with time and can effect the reproducibility of results see Test Method D Proceed to Satm Continue Shopping. The use of a statistical regimen to establish the control limits and frequency of analysis may be employed to ensure quality deposits are produced.
Make three closely spaced indentations and examine under magnication for aking or blistering of the coating, which is cause for rejection. The inspection lot is then classied as complying or not complying with the requirements based on the results of the inspection sample. The coating is examined for blistering or other evidence of poor adhesion at 43 magnication. Your Alert Profile lists the documents that will be monitored. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Sufficient time must be allowed for large parts to reach oven temperature. These differences also effect non-destructive thickness testing by X-Ray and magnetic means. These coatings are used in applications requiring abrasion and wear resistance. The conversion of Vickers to Knoop using Tables E is not recommended. After 4 min contact, apply glacial acetic acid until the violet color disappears.
ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
The test method, the duration of the test, and number of allowable spots per unit area shall be specied see section 5. These coatings are used in electronic applications providing solderability, bondability, increased electrical conductivity, and resistance to strong alkali solutions.
It is characterized by industrial atmosphere exposure on steel substrates in dry or oiled environments. The phosphorus content of the coating must be known to calculate the thickness of the deposit.
Do not use gas containing hydrogen with high-strength steel parts. Test Method B can be used only for coating requirements that have a numerical limit, such as coating thickness.
NOTE 14—To protect the edges, electroplate the specimens with a minimum of 5 m of nickel or copper prior to cross sectioning.
NOTE 11—The autocatalytic nickel process is dynamic and a daily sampling is recommended. They are used on beryllium and titanium parts for low stress properties. If the document is revised or amended, you will be notified by email.
Fine cracks in the coating on the tension side of the bend are not an indication of poor adhesion. The surface of the coating shall be cleaned prior to testing see Note Any such defects on signicant surfaces shall be brought to the attention of the purchaser before plating. An example is leaded steel which may exhibit liquid or solid embrittlement after heat treatment.
A number in parentheses b7339-7 the year of last reapproval. Last previous edition B — 90 NOTE 16—This method astmm only recommended for deposits in the as-plated condition.