Método de teste padrão ASTM B499 para medição de espessura de revestimento por método magnético: 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.
Significado e uso

5.1 A espessura do revestimento é geralmente importante para o seu desempenho. 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.

Método de teste padrão ASTM B499-2014 para medição magnética de espessura de revestimento: Revestimentos não magnéticos em metais magnéticos

Etapa 1: Escopo

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, não substituí-los.

Observação 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 “retirada magnética”) 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 Valores expressos em unidades do SI serão considerados padrão. Os valores dados entre parênteses são apenas para referência.

1.5 Esta norma não se destina a abordar todas as questões de segurança (caso existam) associado ao seu uso. É responsabilidade dos usuários desta norma estabelecer práticas adequadas de segurança e saúde e determinar a aplicabilidade das restrições regulatórias antes do uso..