| 摘要 |
A solar collector plate made of stainless steel or a metal having a nickel-flash coating is immersed in a molten dichromate salt bath at a temperature between about 375 DEG C. and about 500 DEG C. sufficiently long to provide a selective oxide coating which has a Figure of Merit of at least about 4. The oxide coating is continuous, has a microscopically nodular texture with the average nodule size being at least about 5000 A and displays a Figure of Merit of at least about 4.
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