PROCESS FOR MAKING A SELECTIVE ABSORBER FOR A SOLAR COLLECTOR

摘要

The invention relates to a manufacturing process for a selective absorber for a collector panel of solar radiation with high absorption and low emissivity. The process consists in making the collector panel of the absorber from an iron alloy containing in particular such a filler metal as chromium in the alloyed state and in subjecting said surface to an anodic oxidation in an acid electrolytic bath containing metalloid-based electrically active substances, in particular such sulfur based substances as sulfides. The process of the invention allows making collector panels at low cost and with high selectivity without thereby incurring the danger of degrading said panels either at average or high temperatures.