4 Sep ASTM B 标准 – Designation: B – 97 Standard Specication for Autocatalytic (Electroless) Nic. Designation: B – 04 Standard Speci?cation for Autocatalytic (Electroless) Nickel-Phosphorus Coatings on Metal 1 This standard is issued under the?xed. 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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These coatings are used in electronic applications providing solderability, bondability, increased electrical conductivity, and resistance to strong alkali solutions. Thickness shall be assessed either by microscopical method, a magnetic induction instrument, beta backscatter method, a micrometer, weigh-plate-weigh method, coulometric method, or X-ray spectrometry.
These coatings are used in applications requiring abrasion and wear resistance. The coatings are grouped into the following classification systems: Per B paragraph 6.
ASTM B733 Class 3 post heat treatment vs. ASTM B850 embrittlement relief
Bb733 say that this plating has a Class 2 requirement Heat Treat for Hardnessand it also needs Hydrogen Embrittlement relief. This specification establishes the requirements for autocatalytic electroless nickel-phosphorus coatings applied from acidic aqueous solutions to metallic products for use in engineering ashm operating at elevated temperatures. Link to Active This link will always route to the current Active version of the standard. Electroless nickel is generally applied to a aatm range of 25 to microns 0.
They are also used for the salvage of worn or mismachined parts. Coatings with phosphorus contents greater than ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. This standard does not purport to address all of the safety concerns, if any, associated with its use.
Which of these would be performed first?
Adhesion shall be examined either by bend, impact, or thermal shock tests. If I am coating primarily for corrosion protection, I can select a class 3 post heat treatment to improve adhesion and to provide for hydrogen embrittlement relief. Some companies consider the high temperature bake as sufficient to replace the hydrogen embrittlement relief astk it can be done within 4 hours, but you would need to check with your customer first before going down that route.
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Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining. So, astk it is hydrogen embrittlement relief bake first and heat treatment second.
The chemical and physical properties of the deposit vary primarily with its phosphorus content and subsequent heat treatment. It is the responsibility of the user of ashm standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. These coatings are used in electronic applications providing solderability, bondability, increased electrical conductivity, and resistance to strong alkali solutions.
Adtm coatings shall be sampled and tested accordingly to evaluate both acceptance appearance, thickness, adhesion, and porosity and qualification requirements composition, microhardness, and hydrogen embrittlement. February 24, astn apologies, finishing.
ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
Active view current version of standard. After submitting, you’ll be able to save the document locally. Hi Richard, Bit of an odd one this. 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. They are also used for the salvage of worn or mismachined parts. They are used on beryllium and titanium parts for low stress properties. Thanks for your help. Electroless Nickel plating ENalso known as autocatalytic nickel, is a micro crystalline to amorphous, hardenable nickel-phosphorous alloy coating.
What is the answer to the Heat Treatment vs. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Since no high asmt low current densities exist, a very uniform thickness of deposits over irregular shapes can be achieved. Hi Richard, If the high temperature treatment cannot be done within a reasonable time at least within 4 hours of plating then the embrittlement relief bake needs to be done first.
Electroless Nickel Plating
The coatings covered here are alloys of nickel and phosphorus produced by self-sustaining autocatalytic chemical reduction with hypophosphite. It offers a good barrier coating corrosion resistance.
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Nonmagnetic Coatings on Magnetic Basis Metals. Prior to plating, substrates should be pretreated adtm stress relief for reducing risks of hydrogen embrittlement, peening, and racking. These coatings are used in applications requiring abrasion and wear resistance.
The chemical makeup of the plating solution and the use of the solution can affect the porosity and corrosion resistance of the deposit.
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