| 摘要 |
PURPOSE:To obtain a heat collecting plate high in performance and easy in waste water processing by a method wherein a stainless steel plate is processed in a solution mixture of copper sulfate solution and sulfuric acid solution to form a selectively absorbing film on the surface. CONSTITUTION:The stainless steel plate of SUS430 is processed for degreasing for ten minutes in a degreasing solution of 85 deg.C which is obtained by mixing sodium carbonate aqueous solution of a density of 70g/l and sodium hydroxide aqueous solution of a density of 18g/l. Then the steel plate is processed in the solution mixture of copper sulfate solution of a density of 110g/l and sulfuric acid solution of a density of 100cc/l for three hours at the temperature of 105 deg.C. |
