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Standard Guide for Selection of Porosity and Gross Defect Tests for Electrodeposits and Related Metallic Coatings
Automatische name übersetzung:
Standard-Leitfaden für die Auswahl der Porosität und Gross Defect Tests für Galvanische und Verwandte Metallische Überzüge
NORM herausgegeben am 1.12.2013
Bezeichnung normen: ASTM B765-03(2013)
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 1.12.2013
SKU: NS-8022
Zahl der Seiten: 4
Gewicht ca.: 12 g (0.03 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
electrodeposits, gross defect, mechanical damage, metallic coatings, porosity, porosity testing, wear-through, ICS Number Code 25.220.40 (Metallic coatings)
Significance and Use | ||||||||||||||||||||||||||||||||||
4.1 Porosity tests indicate the completeness of protection or coverage offered by the coating. When a given coating is known to be protective when properly deposited, the porosity serves as a measure of the control of the process. The effects of substrate finish and preparation, plating bath, coating process, and handling, may all affect the degree of imperfection that is measured. 4.2 The tests in this guide involve
corrosion reactions in which the products delineate pores in
coatings. Since the chemistry and properties of these products may
not resemble those found in service environments, these tests are
not recommended for prediction of product performance unless
correlation is first established with service experience.
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1. Scope | ||||||||||||||||||||||||||||||||||
1.1 This guide describes some of the available standard methods for the detection, identification, and measurement of porosity and gross defects in electrodeposited and related metallic coatings and provides some laboratory-type evaluations and acceptances. Some applications of the test methods are tabulated in 1.2 This guide does not apply to coatings that are produced by thermal spraying, ion bombardment, sputtering, and other similar techniques where the coatings are applied in the form of discrete particles impacting on the substrate. 1.3 This guide does not apply to beneficial or controlled porosity, such as that present in microdiscontinuous chromium coatings. 1.4 Porosity test results (including those for gross defects) occur as chemical reaction end products. Some occur in situ, others on paper, or in a gel coating. Observations are made that are consistent with the test method, the items being tested, and the requirements of the purchaser. These may be visual inspection (unaided eye) or by 10× magnification (microscope). Other methods may involve enlarged photographs or photomicrographs. 1.5 The test methods are only summarized. The individual standards must be referred to for the instructions on how to perform the tests. 1.6 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.7 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 prior to use. |
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2. Referenced Documents | ||||||||||||||||||||||||||||||||||
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Historisch
1.6.2012
Historisch
1.6.2011
Historisch
1.6.2010
Historisch
1.11.2011
Historisch
15.6.2014
Historisch
1.6.2012
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