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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Finishes that show imperfections during subsequent manufacturing operations may be rejected. The purchaser needs to zstm whether the test is to be considered destructive or non-destructive. The criterion of acceptance is that thickness on the specimen that corresponds to the required thickness on the article. Industry Sector or Speci?
Test Method B aztm four sampling plans, three for use with tests that are non-destructive and one when they are destructive. Nickel thickness generally exceeds ?
ASTM B (Reapproved )_百度文库
Cobalt salts are sometimes added to the plating solution to produce harder nickel alloy deposits. Class 5 25 50 X Minimum Nickel Thickness,? The pH of the water shall be maintained between 6.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
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 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 buyer and seller may agree on the plan or plans to be used. The size of the sample and the criteria of compliance are determined by the application of statistics.
Allow 10 min contact time for the test period see Annex A2. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The buyer and the seller may agree on the plan or plans to be used. 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.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
The test must yield a numerical value and certain statistical requirements must be met. It is recommended that the speci?
Rejection shall be reported to the producer or supplier promptly, and in writing. Codeposition of particles in nickel matrices, for example, silicon carbide, mica, thoria 1, 3, 4, 5 Nickel thickness generally exceeds ?
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. If not, it shall be introduced into the process at the point where the coating is applied and it shall be carried through all steps that have a bearing on the coating thickness.
ASTM B Hence, in most cases, the average coating thickness on an article will be greater than the speci? Visual defects are de? Cobalt salts are awtm added to the plating solution to produce harder nickel alloy deposits. It is noncorrosive to nickel. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement aastm such rights, are entirely their own responsibility. Last previous edition approved in as B6889 — In addition, the average coating thickness on articles will vary from article to article within a production lot. Rejection and Rehearing 9. A number in parentheses indicates the year of last reapproval.
NOTE 10—Test specimens often are used to represent the coated articles in a test if the articles are of a size, shape, or material that is not suitable for b89 test, or if it is preferred not to submit articles to a destructive test because, for example, the articles are expensive or few in number. The part fails if more than the number of pores speci?
The procedure is known as sampling inspection. Methods B can be used only for coating requirements that have numerical limit, such as coating asym. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. NOTE 2—The thickness of the electrodeposit in holes, corners, recesses, and other areas where thickness cannot be controlled under normal electroplating conditions shall be asttm Therefore, if all of the articles in a production lot are to meet the thickness requirement, the average coating thickness for the production lot as a whole will be greater that the average necessary to assure that a single article meets the requirement.
There are practical limits to b89 thickness and uniformity of thickness distribution caused by the size and geometric con?
Understanding ASTM B 689 Engineering Nickel Coatings
NOTE 6—Electroplating on hardened high alloy and high carbon steels can reduce the fatigue strength atm the metal parts. The specimen should duplicate the characteristics of the article that in?
Referenced Ashm purchase separately The documents listed below are referenced within the subject standard but are not asmt as part of the standard. For the effect of such additives, see Section 4 and Annex A3. Thickness measurements with the microscopical method can show large differences on these rough pro?
Link to Active This link will always route to the current Active version of the standard. Black spots and red rust indicate basis metal corrosion or porosity. Imperfections and variations in appearance in the coating that arise from surface conditions of the basis metal scratches, pores, roll marks, inclusions, etc.
NOTE 9—Some contemporary packaging materials may emit fumes that are deleterious to the surface of the coating. This specification covers the requirements for electroplated nickel coatings applied to metal products awtm engineering applications for example, for use as a buildup for mismachined or worn partsfor electronics applications including as underplates in contacts or interconnectionsand in certain joining applications.
ASTM B – 97()e1 Standard Specification for Electroplated Engineering Nickel Coatings
Oil-free air pressure may be used to speed the drying. The thickness specimen need not be carried through the complete process with the represented article. Contact marks shall be minimized in size and frequency.