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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Three standards Test Method BGuide Band Test Method B contain sampling plans that are designed for the sampling inspection of coatings. Also, discoloration due to heat treatment shall not be cause for rejection unless special heat treatment atmosphere is specied see section 5. Use the test methods described in 9. The program involved plating Standards Subsctiption may be the perfect solution. A suitable method shall activate the surface and remove oxide and foreign materials, which may cause poor adhesion and coating porosity.
Subscription pricing is determined by: Properly performed this will aatm coated products of satisfactory quality and will reduce the amount of acceptance inspection. NOTE 10—Usually, when a collection of coated parts the inspection lot 8. NOTE 9—The thickness of the coating cannot be controlled in blind or small diameter deep holes or where solution circulation is restricted.
The phosphorus content of the coating must be known to calculate the thickness of the deposit. Any such defects on signicant surfaces shall be brought to the attention of the purchaser before plating. The wear rate shall be specied by the purchaser and agreed atsm by the producer.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. These coatings are used in electronic asmt providing solderability, bondability, increased electrical conductivity, and resistance to strong alkali solutions. The instrument must be calibrated with standards having the same composition as the coating.
Any red spots remaining indicate pores. The rhombic Knoop indenter gives higher hardness readings than the square-base pyramidal Vickers diamond indenter for to g loads, see Ref 6. 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. Individual alloys should be tested for maximum hardness attainable, especially for conditions of lower temperatures and longer times.
Careful attention to the selection of TYPE will insure optimum performance of the deposit in the intended application. Care should be taken to control the humidity between tests. An example is leaded steel which may exhibit liquid or solid embrittlement after heat treatment. 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.
Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining. 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 precision and bias bb733-97 will vary for each type of test. The weight percent of phosphorus shall be in the range designated by asrm classication see 4. Avoid rapid heating and cooling of plated parts. The conversion of Vickers to Knoop using Tables E is not recommended.
For Coatings requiring alloy analysis and corrosion testing weekly sampling should be considered as an option. Do not use gas containing hydrogen with high-strength steel parts.
These differences also effect non-destructive thickness testing by Aztm and magnetic means. For Class 2 coatings, the microhardness shall equal or exceed a minimum of HK or equivalent Vickers see 4. NOTE 16—This method is only recommended for deposits in the as-plated condition. The pH of the aerated water should be 6. Report the mean and standard deviation for the coating.
Rough, non uniform surfaces require thicker coatings astk smooth surfaces to achieve maximum corrosion resistance and minimum porosity.
ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
The hardness of CS wheels can change with time and can effect the reproducibility of results see Test Method D This standard has been approved for use by agencies of the Department of Defense. Asgm last must yield a numerical value and certain statistical requirements must be met.
Coatings that show imperfections may be rejected.