ASTM B488 PDF

Thank you for visiting the Advanced Plating Technologies Specification Database . Below is a technical summary of specification ASTM B from ASTM for. Our gold plating services comply with different categories of specifications, such as MIL-G, ASTM B, and AMS Gold plating compliant to. Accurate Precision Plating has 50 years experience performing gold plating services under the ASTM B certification & standard. Call today!.

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B — 11 Standard Speci? A number in parentheses indicates the astn of last reapproval. This standard has been approved for use by agencies of the Department of Defense. Several types of coatings, differing in gold purity and hardness, are covered by this speci?

Values provided in parentheses are for information only. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations asttm to use.

Current edition approved Oct. Originally approved in Last previous edition approved in as B — 01 e Can be the source of corrosion products or tarnish? The thickness of an underplating is usually greater than 1? Almost all gold electrodeposits will contain potassium, carbon and nitrogen that are occluded or precipitated in the deposit.

In the case of Type I gold, the occluded asm has been shown to improve durability and is desirable for that reason. The military standard designation of Grade is astk for reference. Examples of commonly speci? The last approved version of this historical standard is referenced on www.

The surface must be chemically clean and continuously conductive, that is, without inclusions or other contaminants. They must be smooth and as free of scratches, gouges, asmt, and similar imperfections as possible.

However, these may not be normal in the treatment steps preceding the plating and a special agreement is indicated. Special racks may involve the use of conforming, auxiliary, bipolar electrodes, or nonconducting shields.

Type, Code, and thickness or mass per unit asttm see Section 4. Any such defects on signi?

Such stress relief shall not reduce the hardness to a value below the speci? Acid pickling of high strength steels shall be avoided. The location of rack or wire marks in the coating shall be agreed upon between the purchaser and the supplier. Nickel underplatings are also applied for other reasons see Appendix X6. NOTE 6—When the thickness of the nickel underplate has a detrimental impact on the mechanical properties or bondability of the substrate, the nickel thickness may be reduced to a non-detrimental level as speci?

NOTE 7—In certain instances in which high-frequency analog signals are employed, such as in wave guides, the magnetic properties of nickel may attenuate the signal. NOTE 8—In applications in which forming or? A minimum of 0. A minimum rinse time of 2. Best practice calls for a minimum of three dragout rinses and one running rinse with dwell times of 40 s in each station when rack plating and 80 s when barrel plating.

Modern, high-velocity impingement-type rinses can reduce this time to a few seconds. This is particularly useful in automatic reel-to-reel applications in which dwell times are signi? Coating Requirements Coating Requirements 7.

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All other metals excluding potassium and sodium are considered impurities and shall not be present in amounts greater than 0. For Type I Code B and C coatings, metallic hardening agents such as nickel, cobalt or iron combined shall be equal to or less than 0.

All other metals are considered impurities and shall not be present in amounts greater than 0.

ASTM B Gold Plating & Electroplating Certification | Accurate Precision Plating

Type II coatings may contain metallic hardening agents, such as nickel, cobalt or iron, which may be present in amounts greater than 0. All other metals, excluding potassium and nitrogen, shall be considered impurities and shall not be present in amounts greater than 0.

Individual metal impurities shall not be present in a quantity greater than 0. Iron, nickel and cobalt combined shall be less than 0. All astn metals, excluding potassium and sodium, are considered impurities and shall not be present in amounts greater than 0. However, care must be taken to ensure that the thickness of the Type I or Type II gold topcoat is sufficient so as not to compromise wear properties.

When measuring the total gold thickness of duplex composite coatings, a density of When plated parts are used in mating applications, the maximum thickness shall not exceed the tolerance speci? It is customary that allowance b4488 plated coatings be included within the part tolerance. NOTE 11—The coating thickness requirement of this speci? Variation in the coating thickness from point to point on a coated article is an inherent characteristic of electroplating processes.

Therefore, the coating thickness at any single point on the signi? Hence, most average coating thicknesses will be greater than the speci? In addition, the average coating thickness on articles will vary from article to article within a production lot.

ASTM B – 18 Standard Specification for Electrodeposited Coatings of Gold for Engineering Uses

Therefore, if all the articles in a production lot are to meet the thickness requirement, the average coating thickness for the production lot asrm a whole will be greater than the average necessary to ensure that any single article meets the requirement see 8. For some applications this requirement may be relaxed to allow for a small number of such defects per unit areaespecially if they are outside or on the periphery of the signi?

The asmt amount of porosity in the coating depends on the severity of the environment that the article is adtm to encounter during service or storage. If the pores are few in number or away from the signi? Ast acceptance or pass-fail criteria, if required, shall be part of the product speci? Properly performed, this process will ensure coated products of satisfactory quality and will reduce the amount of acceptance inspection. The sampling plan used for the inspection of the quality of the coated articles shall be as agreed upon between the purchaser and the supplier.

NOTE 12—Usually, with a collection of coated articles, the inspection lot see 8.

The inspection lot is then classi? The size of the sample and the criteria of compliance are determined by the application of statistics. The procedure is known as ast inspection. Test Method B contains four sampling plans, three for use with tests that are nondestructive and one with those that are destructive.

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The purchaser and supplier may agree on the plan or plans to be used. If they do not, Test Method B identi? Guide B provides a large number of plans and also gives guidance in the selection of a plan. When Guide B is speci? Test Method B can be used only for coating requirements that have a numerical limit, such as coating thickness. The test must yield a numerical value and certain statistical requirements must be met.

Test Method B contains several plans and also gives qstm for calculating plans to meet special needs. Other calibration standards for gold are generally certi? Initial scanning should be carried out for all elements in order to detect any unknown or unexpected metallic impurities.

Gold Plating

b88 Deposit purity should be determined on samples at plating conditions representative of actual production. Deposit hardness should be determined on samples at plating conditions representative of actual production.

The cross-sectioning and magnetic methods measure the geometrical thickness of the gold zstm. Since many gold coatings have a density lower than the theoretical density of gold To convert mass of gold per unit area that is present over the measured area to a geometrical thickness, it is necessary to use v488 having a density identical to that of the coatings to be measured, or to multiply the reading obtained by factor, f. Examine the fracture at a magni?

Cracking without separation does not indicate poor adhesion unless the coating can be peeled back with a sharp instrument. No separation of the coating from the substrate shall occur.

See Guide B for guidelines for selecting the appropriate test method. NOTE 14—The test to be selected will depend upon the gold thickness, the nature of the basis metal, the nature and thickness of any intermediate layers or underplate, the shape of the gold-coated part, and its intended service environment. Special Government Requirements Government or an agent of the U.

The gold thickness on signi? Government and Military, including as subcontracts, shall be packaged in accordance with Practice D Some typical uses of gold coatings are enumerated below, but the list is not complete and is intended for general guidance only. Oxidation of co-deposited metals can make soldering more difficult. It is strongly recommended that gold coating thicknesses not exceed 0.

Coatings with purities of Asfm of b4888 type and thickness of the gold coating is determined by the desired life in the operating environment asym the electroplated component. A suggested four-point b48 is detailed in Test Method F The conductivity of the water extract is measured, and the increase in conductivity due to residual salts and other conducting impurities is calculated. A suggested water extract conductivity test method uses a procedure in accordance with Test Methods D, Method A.

To prepare equilibrated water,? CO2 is a component of air.

It is soluble in water and forms carbonic acid that ionizes and is at equilibrium at 0.

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