Inventors:
James L. Brandt - Monroeville PA
William King - Lower Burrell PA
James Dean Minford - New Kensington PA
Clement E. Valchar - Lower Burrell PA
Assignee:
Aluminum Company of America - Pittsburgh PA
International Classification:
C23F 706
Abstract:
A selective black coating on aluminum is provided which is characterized by a high absorptivity in the visible and near infrared regions of the spectrum (0. 38 to 1. 9 microns) and a low emissivity for radiation of longer-(infrared)-wavelength (greater than 6 microns). The black or near black coating is applied by immersing the aluminum in a bath containing soluble borate and silicate salts.