1 Resumo do Método
The wheel hub is thoroughly cleaned with ultrapure water and air-dried. A scraper is used to remove the topcoat, intermediate coating and primer on the surface. After microwave digestion, the concentration of chromium is determined by flame atomic absorption spectrometry at a wavelength of 357.9 nm.
2. Âmbito de aplicação
Determination of chromium in surface coatings of wheel hubs
3 Padrão de Referência
IEC 62312
4 Instruments and Reagents
4.1 Instrumentos e equipamento
4.1.1 Analytical Instruments
表格
| Não. | Nome | Quantidade | Requisitos Técnicos | Acessórios |
|---|---|---|---|---|
| 1 | Espetrofotometro de Absorção Atômica de Flame | 1 conjunto | — | Lampa de Chromium Hollow Cathode |
| 2 | Acetylene Gas Cylinder | 1 cilindro | Pureza ≥ 99,99% | — |
| 3 | Compressor de ar | 1 unidade | Pressão de escape estimada: 0,3 MPa | — |