1 Method Overview
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 Scope of Application
Determination of chromium in surface coatings of wheel hubs
3 Reference Standard
IEC 62312
4 Instruments and Reagents
4.1 Instruments and Equipment
4.1.1 Analytical Instruments
表格
| No. | Name | Quantity | Technical Requirements | Accessories |
|---|---|---|---|---|
| 1 | Flame Atomic Absorption Spectrophotometer | 1 set | — | Chromium Hollow Cathode Lamp |
| 2 | Acetylene Gas Cylinder | 1 cylinder | Purity ≥ 99.99% | — |
| 3 | Air Compressor | 1 unit | Rated exhaust pressure: 0.3 MPa | — |