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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Please note that price shown is for minimum thickness. Base metal condition, undercoats, surface preparation, and post processing all have a signi? The coefficient of friction and stress of deposit are also reduced in comparison to electro-plated bright nickel. The chemical makeup of the plating solution and the use of the solution can affect the porosity and corrosion resistance of the deposit.
Insertion of a sharp probe at the interface of the coating and basis metal to determine the adhesion is suggested. Consideration of the risk of stripping the deposit should always be considered when selecting this coating. If an alternate test is speci? An inspection lot shall be de?
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. Rejection and Rehearing Use the test methods described in 9. Its main use is in engineering applications. The use of a statistical regimen to establish the control limits and frequency of analysis may be employed to ensure quality deposits are produced.
Properly performed this will ensure coated products of satisfactory quality and will reduce the amount of acceptance inspection. Our process uses the most recent technology which meets the automotive end of life vehicle ELV initiatives and specifications.
Care should be taken to control the humidity between tests. The chemical and physical properties of the deposit vary primarily with its phosphorus content and subsequent heat treatment.
Deposits that are less than 7.
The size of the sample and the criteria of compliance are determined by the application of statistics. Please call us x if you don’t see your specification listed here. The heat treatment temperature was considerably higher than typical processing and was chosen to evaluate the formation of diffusion products of iron, nickel and phosphorus. After all the electroless nickel is removed, the part should be rinsed in clean rinse water.
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. Current edition approved Aug. They are used on beryllium and titanium g733-04 for low stress properties. NOTE 16—This method is only recommended for deposits in atsm as-plated condition.
Please keep in mind that the thicknesses called out in the various specifications represent “thickness per b73304. Deposits higher than 7.
The amount of material removed varies from nothing to 0. Further, hydrogen embrittlement relief baking for at least 3 hours is required after plating on steels that have been heat-treated to a hardness above Rockwell C Coatings with phosphorus contents greater than In all cases, the duration of the heat treatment shall commence from the time at which the whole of each part attains the speci? This tar will be difficult to remove from the article after stripping.
These coatings are used in applications requiring abrasion and wear resistance. Already Subscribed to this document. Thermal treatment for adhesion improvement on ferrous alloys containing carbon and hardened aluminum.
Electroless Nickel Coating
For Class 2 coatings, the microhardness shall equal or exceed a minimum of HK or equivalent Vickers see 4. In this aetm, the part shall be heat treated as soon as possible. When processing some copper or steel alloys, it is advisable to apply a copper undercoat that will prevent the attack of the substrate was the stripping nears completion.
The thickness of the coating can vary from 2 micron up to 30 micron. Continue to boil the water for 30 min.