Bedeutung und Verwendung

5.1 Die Dicke der Beschichtung ist im Allgemeinen wichtig für ihre Leistung. For most non-ferrous coatings on steel, the magnetic method is reliable for non-destructively measuring coating thickness and is suitable for specification acceptance testing and SPC/SQC applications.

5.2 This test method should not be used to determine the thickness of electrodeposited nickel coatings on steel. Test method B530 is suitable for this determination.

ASTM B499-2014 Standardtestmethode zur magnetischen Messung der Beschichtungsdicke: Nichtmagnetische Beschichtungen auf magnetischen Metallen

Schritt 1: Umfang

1.1 This test method includes the non-destructive measurement of the thickness of a non-magnetic coating on a black or other magnetic base metal using a magnetic instrument. It is intended to complement the manufacturer’s instructions on the operation of the instrument, not to replace them.

Notiz 1 – Nickel-Phosphorus alloys with self-catalytic deposition containing more than 8% phosphorus measured by this test method are sufficiently non-magnetic as long as they are measured prior to any heat treatment.

1.2 These instruments measure the magnetic attraction between the magnet and the base metal, which is affected by the presence of a coating (classified as “magnetic pull off”) or by changes in the magnetic flux density within the probe (classified as “electron”). These instruments cannot distinguish the thickness of individual layers. They can only measure the cumulative thickness of all layers below the probe, down to the base metal.

1.3 Measurements made in accordance with this test method shall comply with the requirements of ISO International Standard 2178, printed in 1982.

1.4 In SI-Einheiten ausgedrückte Werte gelten als Standard. Die in Klammern angegebenen Werte dienen nur als Referenz.

1.5 Diese Norm soll nicht alle Sicherheitsbedenken berücksichtigen (wenn überhaupt) mit seiner Verwendung verbunden. Es liegt in der Verantwortung der Benutzer dieser Norm, vor der Verwendung geeignete Sicherheits- und Gesundheitspraktiken festzulegen und die Anwendbarkeit behördlicher Beschränkungen zu bestimmen.