1.1 These test methods cover accelerated determination of the resistance of porcelain enamel coatings on aluminum alloys to spalling from exposure to moisture or weathering. Test Method A,2 using a 5 % solution of ammonium chloride, requires 96-h immersion while Test Method B,3 using a 1 % solution of antimony trichloride, is completed after 20 h of immersion. The spalling tendency is evaluated by the same criteria in both methods. While either method is suitable for magnesium silicon alloys, such as 6061, Test Method B is preferred for simple alloys or commercially pure aluminum, such as 1100.
1.2 The test methods appear in the following order:
| Sections |
Test Method A—Ammonium Chloride | 4 – 9 |
Test Method B—Antimony Trichloride | 10 – 15 |
3.1 It is difficult to overemphasize the importance of the spall test. Porcelain enameled aluminum that fails this test will probably spall in service if subjected to moisture or weathering.
SDO | ASTM: ASTM International |
Document Number | C703 |
Publication Date | Nov. 1, 2016 |
Language | en - English |
Page Count | 3 |
Revision Level | 72(2016) |
Supercedes | |
Committee | B08.12 |