| 摘要 |
<p>The invention provides a novel method of manufacturing a sacrificial anode rod assembly for cathodically protecting the internal surfaces of ferrous metal watercontaining vessels, such as water heater tanks, which method provides an elongated anode rod member of a galvanically active metal and an externally threaded cap member wherein the anode rod member and cap member are connected in a tightly locked, leakproof engagement which not only results in superior mechanical and electrical properties of the anode assembly but also aids substantially in prolonging the effective life of the anode rod assembly. In the method of forming the assembly, the cap member which has an internal recess is positioned onto the extremity of the anode rod and axially aligned therewith. Through the application of a force applied to the cap member, the metal in the extremity of the anode rod is subjected to a metallurgical upsetting operation while not affecting or damaging the integrity of the external surfaces of the cap member or its external threads. The instant method causes the metal of the extremity of the anode rod member to conform to the shape of the internal recess or bore of the cap member (which recess has at least one enlarged portion remote from its opening). For further increasing the effective life of the anode rod assembly, the method also advantageously provides for forming a bulged or enlarged portion of anode metal at the base of the cap member.</p> |
