ASTM B499 Metodo di prova standard per la misurazione dello spessore del rivestimento mediante metodo magnetico: Non-magnetic Coatings on Magnetic Metals includes non-destructive measurement of the thickness of non-magnetic coatings on black or other magnetic base metals using a magnetic instrument.
Significato e uso

5.1 Lo spessore del rivestimento è generalmente importante per le sue prestazioni. 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.

Metodo di prova standard ASTM B499-2014 per la misurazione magnetica dello spessore del rivestimento: Rivestimenti non magnetici su metalli magnetici

Fare un passo 1: Scopo

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.

Nota 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 (classificato come “magnetic pull off”) or by changes in the magnetic flux density within the probe (classificato come “elettrone”). 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 I valori espressi in unità SI sono considerati standard. I valori indicati tra parentesi sono solo di riferimento.

1.5 Questo standard non è destinato ad affrontare tutti i problemi di sicurezza (se presente) legati al suo utilizzo. È responsabilità degli utenti di questo standard stabilire adeguate pratiche di sicurezza e salute e determinare l'applicabilità delle restrizioni normative prima dell'uso.