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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So, generally it is hydrogen embrittlement relief bake first and heat treatment second. Which of these would be performed first?
ASTM B Class 3 post heat treatment vs. ASTM B embrittlement relief
Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining. 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.
Coatings with phosphorus contents greater than February 24, — apologies, finishing. They are used on beryllium and titanium parts for low stress properties. The coatings covered here are alloys of nickel and phosphorus produced by self-sustaining autocatalytic chemical reduction with hypophosphite. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. They are also used for the salvage of worn or mismachined parts. The chemical makeup of the plating solution and the use of the solution can affect the porosity and corrosion resistance of the deposit.
USC offers a proprietary method – for applying electroless nickel to aluminum alloys. Please fill out this brief form to access the free PDF download of U. Medical device plated with a duplex coating of 0.
ASTM B733 Class 3 post heat treatment vs. ASTM B850 embrittlement relief
The coatings shall be sampled and tested accordingly to evaluate both acceptance appearance, thickness, adhesion, and porosity and qualification requirements composition, microhardness, and hydrogen embrittlement. These coatings are used in electronic applications providing solderability, bondability, increased electrical conductivity, and resistance to strong alkali solutions. Some companies consider the high temperature bake as sufficient to replace the hydrogen embrittlement relief if it can be done within 4 hours, but you would need to check with your customer first wstm going down that route.
Excellent corrosion resistance – dependent on phosphorous content hours per ASTM B are typical.
What is the answer to the Heat Treatment vs. Let’s say that this plating has a Class 2 requirement Heat Treat for Hardnessand it also needs Hydrogen Embrittlement relief. astn
The chemical and physical properties of the deposit wstm primarily with its phosphorus content and subsequent heat treatment. It offers a good barrier coating corrosion resistance. Prior to plating, substrates should be pretreated by stress relief for reducing risks of hydrogen embrittlement, peening, and racking.
Hi Richard, Bit of an odd one this.
Nonmagnetic Coatings on Magnetic Basis Metals. Visit our Resource Library for Design Recommendations. Guide ASTM B is a better document to use as a guide to the minimum times for de-embrittlement operations, especially true when you get up the the high tensile strength or very hard materials.
Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining. This standard does not purport to address all of the safety concerns, if any, associated with its use. Nonmagnetic Coatings on Magnetic Basis Metals. The chemical and physical properties of the deposit vary primarily with its phosphorus content and subsequent heat treatment.
ASTM B Specification | Electroless Nickel – Phosphorous Coatings | General Metal Finishing
They are used on beryllium and titanium parts for low stress properties. Electroless Nickel plating ENalso known as autocatalytic nickel, is a micro crystalline to amorphous, hardenable nickel-phosphorous alloy coating. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Does specifying embrittlement relief baking per Guide B replace Class 3 post heat treatment or should it be specified in addition to Class 3 post heat treatment?
This specification establishes the requirements for autocatalytic electroless nickel-phosphorus coatings applied from acidic aqueous solutions to metallic products for use in engineering functions operating at elevated temperatures.
Electroless nickel is generally applied to a thickness range of 25 to microns 0. I figure that if I ask a plater to plate a part per a specification, the least I can do is read the specification and give them all of the ordering information they need to plate our parts per the specification. Historical Version s – view previous versions of standard.
Per B paragraph 6. The coatings are grouped into the following classification systems: And porosity shall be inspected either by ferroxyl test, boiling water test, aerated water test, or alizarin test.