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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Also, reduction in b68 fatigue life of nickel-electroplated steels can be reduced by considering the relations among the variables that in? The pH of the water shall be maintained between 6. Adhesion tests may at times fail to detect adhesion failure; subsequent fabrication may reveal poor or inadequate adhesion, which shall be cause for rejection.
Historical Version s – view previous versions of standard. Originally approved in Shot peening of signi? Test Method B Magnetic should not be used for thicknesses less than 10? The procedure is known as sampling inspection.
Variation in the coating thickness from point to point on a coated article is an inherent characteristic of the electroplating process. Three standards, Test Method BGuide Band Methods B contain sampling plans that are designed for the sampling inspection of coatings. Just before use, immerse the dry?
ASTM B689 – 97(2018)e1
Typical mechanical properties of nickel electroplated from these baths, and the combined effect of bath operation adtm solution composition variables on the mechanical properties of the electrodeposit are given in Guide B NOTE 12—Since many factors in?
NOTE 3—When a deposit of controlled thickness is required in holes, corners, qstm, and similar areas, special racking, auxiliary anodes or shielding will be necessary. Cobalt salts are sometimes added to the plating solution to produce harder nickel alloy deposits.
Electronic industry and optical re? 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.
A source of oil-free air shall be available to aerate the water with agitation vigorous enough to prevent air bubbles from clinging to signi?
Hence, in most cases, the average coating thickness on an article will be greater than the speci? The inspection lot is then classi? Methods B can be used only for coating requirements that have numerical limit, such as coating thickness.
When electroplated nickel is required to have higher hardnesses, greater wear resistance, certain residual stress values and certain aastm characteristics, sulfur and other substances are incorporated in the nickel deposit through the use of certain addition agents in the electroplating solution.
Also refer to Guide B for more information. At the end of the test period, b68 the part from the asmt water, and allow the part to drain and dry. Nonmagnetic Coatings on Magnetic Basis Metals. This specification covers the requirements for electroplated nickel coatings applied to metal products for 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.
Class 5 25 50 X Minimum Nickel Thickness,? In addition, the average coating thickness on articles will vary from article to article within a production lot.
ASTM B – 97()e1 – Standard Specification for Electroplated Engineering Nickel Coatings
Thickness measurements with the microscopical method can show large differences on these rough pro? The test must yield a numerical value and certain statistical requirements must be met.
NOTE 6—Electroplating on hardened high alloy and high carbon steels can reduce the fatigue strength of the metal parts. 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 the 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.
Microscopical method Coulometric method Nondestructive Methods: For example, a low-carbon steel specimen may represent a brass article when the magnetic thickness test is used Test Method B Coatings shall be sampled, tested, and conform accordingly to specified requirements as to appearance, thickness measured either destructively by microscopical or coulometric method, or nondestructively by magnetic or X-ray methodadhesion examined either by bend, file, heat and quench, or push testporosity assessed either by hot water, ferroxyl, or flowers of sulfur testworkmanship, and hydrogen embrittlement relief.
Link to Active This link will always route to the current Active version of the standard. The criterion of acceptance is that thickness on the specimen that corresponds to the required thickness on the article.
ASTM B (Reapproved )_百度文库
The thickness specimen need not be carried through the complete process with the represented article. Stress relieving after stripping is not necessary if the stripping is done anodically in an astn solution. Industry Sector or Speci? Test Method B X-ray is instrument-dependent with regard to accuracy with increasing nickel thicknesses.