| 摘要 |
<p>The bottom end of an electrode for chromium plating, comprising a lead sheath, through which a threaded rod of material of higher electrical conductivity is screwed, has a cap of non-conductive material. The cap may be internally threaded, and screwed onto the end of the central rod. Alternatively it may be hollow, and held in place by a nut screwed onto the rod, clamping the base of the cap against the end of the electrode body. The cap itself may have a screwed in removable cover, giving access to the nut, but protecting the protruding end of the threaded central rod. The non-conductive end cap prevents, in simple bar electrodes, swelling of the bottom end, due to structural changes in the lead sheath, caused by preferential action of the electric current. It also prevents stretching of the lead sheath over periods of 18 months or more in service.</p> |
