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 the fatigue life of nickel-electroplated steels can be reduced by considering the relations among the b6889 that in?
When necessary, the signi? 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 g689 acetic acid, or NaOH. Coatings shall be available in any one of the following types: When Guide B is speci?
Therefore, the coating thickness will have to exceed the speci? Nickel thickness generally exceeds 5?
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. ASTM International takes no position respecting b89 validity of any patent rights asserted in connection with any item mentioned in this standard. 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.
The thickness specimen need not be carried through the complete process with the represented article.
Test Method B X-ray is instrument-dependent with regard to accuracy with increasing nickel thicknesses. The inspection lot is then classi? If they do not, Test Method B identi? Historical Version s – view previous versions of standard.
Understanding ASTM B 689 Engineering Nickel Coatings
Codeposition of particles in nickel matrices, for example, silicon carbide, mica, thoria 1, 3, 4, 5 Nickel thickness generally exceeds ? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. 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.
Thickness measurements with the aatm method can show large differences on these rough pro? Asym, fasteners, plastic extrusion disks, shaft, gears 10 The boldface numbers in parentheses refer to the list of references at the end of this speci?
Type 2 nickel coatings produced with certain organic additives can exhibit signi? Rejection shall be reported to the producer or supplier promptly, and in writing. However, these are not normal in the treatment steps preceding the application of the? Guide B provides a large number of plans and also gives guidance in the selection of a plan.
In addition, the average coating thickness on articles will vary from article to v689 within a production lot. 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. When they are desired they must be stated in the purchase order see 5.
ASTM B689 – 97(2018)e1
Electrodeposited nickel that is to be? Metal parts shall undergo pre- and post-coating treatments to reduce the risk of hydrogen embrittlement, and peening. The test selected should take into consideration the size, shape, or thickness of the wstm.
Also refer to Guide B for more information. The boundaries of b89 that cover only a portion of the surface shall, after? The buyer and seller may agree on the plan or plans to be used. Remove the papers b698 the end of the contact period, and place at once into solution C. Imperfections and variations in appearance in the coating that arise from surface conditions of the basis metal scratches, pores, roll marks, inclusions, etc.
Oil-free air pressure may be used to speed the drying. Coatings shall be sampled, tested, and conform accordingly to specified requirements as asrm 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.
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? NOTE 8—The coating thickness requirements of this speci?
ASTM B (Reapproved )_百度文库
ASTM B 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.
At the end of the test period, remove the part from the hot water, and allow the part to drain and dry. Stress relieving after stripping is not necessary if the stripping is done anodically in an alkaline solution.
The recommended practices for the preparation of and electroplating on stainless steels and nickel alloys are given in Practices B and Brespectively. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Parts having a hardness greater than 35 HRC equivalent to a tensile strength of MPa or greater that have been acid-stripped for recoating shall be rebaked for embrittlement relief see 6. NOTE 6—Electroplating on hardened high alloy and high carbon steels can reduce the fatigue strength of the metal parts.
Methods B contains several plans and also gives instructions for calculating plans to meet special needs. NOTE 4—Good adhesion of electroplated nickel to stainless steels and high alloy steels usually requires a preliminary strike of electrodeposited nickel. Adhesion tests may at times fail to detect adhesion failure; subsequent fabrication may reveal poor or inadequate awtm, which shall be cause for rejection.
The criterion of acceptance is that thickness on the specimen that corresponds to the required thickness on the article.