ASTM B() Standard Specification for Autocatalytic (Electroless) Nickel-Phosphorus Coatings on Metal Scope This . This ASTM B standard specification covers the requirements for electroless nickel-phosphorous coatings on metal. For more details call us. The procedure in our factory is carried out according to: AMS-C, or ASTM B The thickness of the coating and the treatments is displayed in the tables.
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ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
Coatings with phosphorus contents greater than This is because there is some substrate removal each time the article is stripped. After 3 min, apply a solution of potassium ferrocyanide prepared by dissolving 1 g of potassium ferrocyanide and 1. The wear rate shall be speci?
Materials and Manufacture 6. 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. When required, one of the following tests can be used on the plated part or specimen. You may delete a document from your Alert Profile at any time. The chemical and physical properties of the deposit vary primarily with its phosphorus content and subsequent heat treatment.
The instrument must be calibrated with standards having the same composition as the coating. Also, discoloration due to heat treatment shall not be cause for rejection unless special heat treatment atmosphere is speci?
Electroless Nickel Coating
Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining. Link to Active This link will always route to the current Active version of the standard.
The precipitation of these high phosphorus deposits may be delayed for several minutes in the mid-range temperatures. Thermal treatment for hardness enlargement. They are also used for the salvage of worn adtm mismachined parts. Then remove the part, air dry, and examine for rust spots, which indicate pores. Alloys of other phosphorus contents have differing hardness versus time and temperature.
Deposits that are less than 7. Standards Subsctiption may be the perfect solution. As the deposit nears complete removal, it is common for a slight etch of the substrate to occur. The chemical makeup of the plating solution and the use of the solution can affect the porosity and corrosion resistance of the deposit.
Care should be taken to control the humidity between tests. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Do not use gas containing hydrogen with high-strength steel parts.
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. These coatings are used in electronic applications providing solderability, bondability, increased electrical conductivity, and resistance to strong alkali solutions. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
If an alternate test is speci? The coating is carried out in a watery solution, containing metallic ions, complexes and stabilizers. The precision and bias requirements will vary for each type of test. NOTE 2—The performance of the autocatalytic nickel coating depends to a large extent on the surface? In the case of dissatisfaction occurs with the results of a test, the producer may make a claim for a hearing.
Rounding of the test results due to the precision of the limits provides for an effective limit of 4. An inspection lot shall be de? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
High phosphorus deposits may require longer time or a higher temperature, or both. Undercoats may be required to facilitate rework. Coatings with phosphorus contents greater than These differences also effect non-destructive thickness testing by X-Ray and magnetic means.
Already Subscribed to this document. The purchaser aetm producer may agree on the plan s to be used. NOTE 16—This method is only recommended for deposits in the as-plated condition. To reface the wheels use CS discs from Taber.
Electroless Nickel Plating
asm The use of a statistical regimen to establish the control limits and frequency of analysis may be employed to ensure quality deposits are produced. 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.
Deposit properties of Electroless Nickel far exceed those of electro-plated bright nickel.