ASTM B (Reapproved )_能源/化工_工程科技_专业资料。 Designation: B – 97 (Reapproved ) Standard Speci?cation for. This ASTM B specification covers the requirements for electroplated nickel coatings applied to metal products for engineering applications. Bright Nickel Plating. ASTM B, AMS-QQ-N bright nickel plated electrical components. At APP we do bright nickel plating, it is widely used for decorative.
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Allow 10 min contact time for the test period see Annex A2. Hence, in most cases, the average coating thickness on an article will be greater than the speci? NOTE 8—The coating thickness requirements of this speci? Aatm electroplated nickel is required to have higher hardnesses, greater wear resistance, certain residual stress values and certain leveling characteristics, sulfur and other substances are incorporated in the nickel deposit through the use of certain addition agents in the electroplating solution.
The size of the sample and the criteria of compliance are determined by the application of statistics. Typical mechanical properties of nickel electroplated from these baths, and the combined effect of bath operation and solution composition variables on the mechanical properties of the electrodeposit are given in Guide B Just before use, immerse the dry?
Thickness measurements with the microscopical method can show large differences on these rough pro? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Rejection and Rehearing 9. Coatings shall be available in any one of the following types: The part fails if more than the number of pores speci? The specimen should duplicate the characteristics of the article that in?
A test may destroy the coating but in a non-critical area; or, although it may destroy the coating, a tested part can be reclaimed by stripping and recoating. Therefore, the coating thickness will have to exceed the speci?
Industry Sector or Speci? Identify the substrate material by alloy astn ASTM International takes no position respecting the validity of any patent zstm asserted in connection with any item mentioned in this standard.
NOTE 12—Since many factors in? Oil-free air pressure may be used to speed the drying.
Understanding ASTM B 689 Engineering Nickel Coatings
Contact marks shall be minimized in size and frequency. Additives required for pH control shall be noncorrosive to nickel and shall be approved by the purchaser, for example, pH can be adjusted by introducing CO2 or by additions of H2SO4 or acetic acid, or NaOH.
NOTE 11—When special test specimens are used to represent coated articles in a thickness test, the specimens will not necessarily have the same thickness and thickness distribution as the articles unless the specimens and the articles are of the same general size and shape.
Current edition approved Feb. Black spots and red rust indicate basis metal corrosion or porosity. Molds, dies, shafts, housings, and precision? Visual defects are de? Methods B contains several plans and also gives instructions for calculating plans to meet special needs.
When contacts must be located on signi? Codeposition of particles in nickel matrices, for example, silicon carbide, mica, thoria 1, 3, 4, 5 Nickel thickness generally exceeds ?
There are practical limits to nickel thickness and uniformity of thickness distribution caused by the size and geometric con? Other—washers, fasteners, plastic extrusion disks, shaft, gears 10 The boldface numbers in parentheses refer to the list of references at the end of this speci? The test is very sensitive to the super? Alloy processes include nickel-phosphorus and nickel-cobalt. Users of this standard are expressly advised b68 determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Nickel thickness generally exceeds 5?
Class 5 25 50 X Minimum Nickel Thickness,? NOTE 3—When a deposit of controlled thickness is required in holes, corners, recesses, and similar areas, special racking, auxiliary anodes or shielding will be necessary. The purchaser needs to state whether the test is to be considered destructive or non-destructive.
Bright Nickel Plating
The buyer and the seller may agree on the plan or plans to be used. If they do not, Methods B identi? NOTE 6—Electroplating on hardened high alloy and high carbon steels can reduce the fatigue strength of the metal parts.
NOTE 9—Some contemporary packaging materials may emit fumes that are deleterious to the surface of the coating. When necessary, the signi? This must be considered if the parts will be subjected to repeated applications of complex load patterns in asmt. Stress relieving after stripping is not necessary if the stripping is done anodically in an alkaline solution.
Link to Active This link will always route to the b6889 Active version of the standard.
Type 1, coatings electroplated from solutions not containing hardeners, brighteners, or stress control additives; Type 2, electrodeposits used at moderate temperatures, and contain sulfur or other codeposited elements or compounds that are present to increase the hardness, refine grain structure, or control internal stress; and Type 3, electroplates containing dispersed submicron particles such as silicon carbide, tungsten carbide, and aluminum oxide that are present to increase hardness and wear resistance at specified temperatures.
When they are desired they must be stated in the purchase order see 5. Cobalt salts are sometimes added to the plating solution to produce harder nickel alloy deposits.
ASTM B Nickel Coating | General Metal Finishing
If they do not, Test Method Astn identi? The purchaser may similarly require that a report of the test results be furnished. Also refer to Guide B for more information.