| 摘要 |
<p>PURPOSE:To repair the stainless steel cathode plate for electrolysis of copper, the surface of which is corroded and discolored by repetitive use and has problems in use so that the cathode plate can be used in a good condition. CONSTITUTION:The stainless steel cathode plate for electrolytic refining of copper, such as stainless steel base plate used for production of a seed plate for electrolytic refining of copper and stainless steel cathode plate used for electrolytic refining of copper or electrolytic sampling of copper, is immersed for 30 seconds to 3 minutes in an aq. soln. contg. 3 to 10wt.% hydrochloric acid and 0.3 to 1.0wt.% hydrogen peroxide and is then subjected to a passivation treatment, by which the cathode plate is reproduced and repaired so as to be well usable.</p> |
