Parts are rack or barrel plated to ASTM B standard thicknesses from ” to “, depending on the base metal and application. Pure % tin is. Designation: B – 97 (Reapproved )e1 Standard Speci?cation for Electrodeposited Coatings of Tin1 This standard is issued under the. ASTM B Standard Specification for Electrodeposited Coatings of Tin.
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When Test Method B is used to measure these types of coatings, the measuring instrument shall be calibrated with thickness standards that have the same substrate and same composition of coating as the product. Class A Minimum Thickness 2.
Addition of the sulfuric acid may be made before the test specimens are placed in position, provided that the cabinet is closed within 5 min of addition of the acid. NOTE 2—Careful preparation of metal surfaces is necessary in order to assure good adhesion and quality. Visual examination, time of wetting, measurement of area of spread, and calculation of spread values are used to assess solderability 1, 2.
Similar to Class A, but for shorter-term contact applications and short shelf-life requirements, subject to purchaser approval. This is in contrast to strikes or? Although the tin surface will remain bright for long periods in the absence of moisture, this invisible surface oxide layer is not truly protective. This specification covers the requirements for electrodeposited tin coatings applied to metallic articles to provide a low contact resistance surface, to protect against corrosion, to facilitate soldering, to provide anti-galling properties, and to be a stop-off coating in the nitriding of high-strength steels.
ASTM B – 13 Standard Specification for Electrodeposited Coatings of Tin
Three standards, Test Method BGuide Band Test Method Bcontain sampling plans that are designed for the sampling inspection of coatings. Rejection and Rehearing 9. The maximum thickness for?
ASTM does not give any h545 express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
In many applications for tin coatings, whisker growth has not been a problem, but there are critical applications X6.
Nonmagnetic Coatings on Magnetic Basis Metals. A superscript epsilon e indicates an editorial change since the last revision or reapproval. The values given in parentheses are for information only. The surface appearance types are matte tin electrodeposits, bright tin electrodeposits, and flow-brightened electrodeposits. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Practice B may be consulted to determine the most appropriate test method. With such thin xstm, a diffusion barrier of nickel may be advantageous, although users should also consider the use of thicker coatings when solderability must be maintained over a period of years 6.
N545 mandrel shall have a diameter equal to the thickness of the sample. Typical Applications Mild service conditions, particularly where the signi? If special test specimens are used 7. The purchaser shall specify whether the tested articles are to receive an arti? If the quality of the deposit is also poor, the blister may crack, and the plating will peel away from the basis metal. The thickness is less in interior corners and holes.
The procedure is known as sampling inspection.
Maintain pressure sufficient to burnish the? Applications are as follows: Therefore, in designing for low-voltage electronic equipment where components are closely spaced, tin coatings should either not be used, or whisker formation should be inhibited or prevented by the application of prevention methods.
Warning—Some contemporary packaging materials may emit fumes that are deleterious to the surface of the coating. The buyer and seller may agree on the plan or plans to be used. If the pores are few in number, or away from signi? Also found on baking pans after re? A thicker coating of nickel may be required in some situations for additional retardation. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Flow-brightened coatings shall be free of dewetted areas and beads. If the sulfur dioxide concentration in the atmosphere is too high, the corrosion product formed is too? Mild service conditions with less severe requirements than Class C below. Where a contact mark is inevitable, its location shall be subject to agreement between the supplier and the purchaser. Current edition approved April 1, The method provided, which depends on the production of sulfur dioxide from the reaction between sodium thiosulfate and sulfuric acid within the test chamber, ensures suitable conditions for the development of immobile corrosion products at discontinuities.