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ASTM B689 PDF

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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Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. At the end of the test period, remove the part from the hot water, and allow the part to drain and dry.

When 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.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? 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 Black spots and red rust indicate basis metal corrosion or porosity.

When 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 purchaser may similarly require that a report of the test results be furnished. NOTE 8—The coating thickness requirements of this speci?

Understanding ASTM B 689 Engineering Nickel Coatings

Current edition approved Feb. If they do not, Methods B identi? Individual reprints single or multiple copies of this standard may be b6889 by contacting ASTM at the above address or at phonefaxor service astm. 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.

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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. The test must yield a numerical value and certain statistical requirements must be met.

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.

NOTE 4—Good adhesion of electroplated nickel to stainless steels and high alloy steels usually requires a preliminary strike of electrodeposited nickel. NOTE 14—When both destructive and non-destructive tests exist for the measurement of a characteristic, the purchaser needs to state which is to be used so that the proper sampling plan is selected.

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 speci?

Bright Nickel Plating

Allow 10 min contact time for the test period see Annex A2. Guide B provides a large number of plans and also gives guidance in the selection of a plan. Industry Sector or Speci? Coatings shall be available in any one of the following types: A superscript epsilon e indicates an editorial change since the last revision or reapproval. Finishes that show imperfections during subsequent manufacturing operations may be rejected.

Aetm Version s – view previous versions of standard. This standard has been approved for use by agencies of the Department of Defense. Visual defects are de? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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.

The specimen should duplicate the characteristics of the article that in? B68 previous edition approved in as B — The astk of the water shall be maintained between 6. Shot axtm of signi? There are practical limits to nickel thickness and uniformity of thickness distribution caused by the size and geometric con?

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Parts having a hardness greater than 35 HRC equivalent to a tensile strength of MPa or aztm that have been acid-stripped for recoating shall be rebaked for embrittlement relief see 6. Nonmagnetic Coatings on Magnetic Basis Metals. If they do not, Test Method B identi? 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

Cobalt salts are sometimes added to the plating solution to produce harder nickel alloy deposits. 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. Therefore, the coating thickness will have to exceed the speci?

For example, a low-carbon steel specimen may represent a brass article when astk magnetic thickness test is used Test Method B Rejection shall be astn to the producer or supplier promptly, and in writing.

Thickness measurements with the microscopical method can show large differences on these rough pro? 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. When necessary, the signi?

Three standards, Test Method BGuide Band Methods B contain sampling plans that b68 designed for the sampling inspection of coatings. The test xstm should take into consideration the size, shape, or thickness of the part. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

In rack plating, the specimen shall be racked in the same way with the same distance from and orientation with the anodes and other items in the process as the article it represents. Just before use, immerse the dry?