发明名称 |
Schwarzchrom-Plattierungsbad für solarselektive Beschichtungen. |
摘要 |
The composition disclosed is an improved black chromium plating bath useful, for example, for solar selective coatings. The bath comprises an aqueous solution of sulphate-free chromic acid containing nitrate, borate and fluorosilicate ions. Such a bath can be employed at room temperature or higher, e.g. in the temperature range 30 DEG C to 50 DEG C, and at a low current density, e.g. 0.07 to 0.28 A/cm<2>, to obtain a good quality black chromium deposit, which is quite coherent and has a high absorptivity to emissivity ratio, e.g. about 8. |
申请公布号 |
DE3883954(T2) |
申请公布日期 |
1994.03.03 |
申请号 |
DE19883883954T |
申请日期 |
1988.01.05 |
申请人 |
COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH, NEW DELHI, IN |
发明人 |
GRIPS, VATIA KRISHNAMURTHY WILLIAM, BANGALORE 560017 KARNATAKA, IN;RAJAGOPAL, INDIRA, BANGALORE 560017 KARNATAKA, IN;RAJAGOPALAN, SUNDARAPANDIUN RAMA, BANGALORE 560017 KARNATAKA, IN |
分类号 |
C25D3/08;(IPC1-7):C25D3/08 |
主分类号 |
C25D3/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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