Corrosion resistant bimetal

Abstract

A corrosion resistant bimetal includes a part and one or more sacrificial anodes. The part includes a metal component that is susceptible to corrosion. The sacrificial anodes consists of an attachment to the part through a metallic bond between the metal component and the sacrificial anode to form a crystalline solid that includes the sacrificial anode and the metal component of the part.

What is claimed is: 
     
         1 . A method for making the corrosion resistant bimetal, comprising:
 attaching a frictional stir additive manufacturing head to a robotic arm or a X-Y head driven over a table on a machine tool bed; and   printing one or more sacrificial anodes onto a part using the frictional stir additive manufacturing head attached to the robotic arm or a X-Y head driven over a table on a machine tool bed, thereby attaching the sacrificial anode to a metal component of the part with a metallic bond forming a crystalline solid that includes the sacrificial anode and metal component of the part.   
     
     
         2 . The method of  claim 1 , wherein the frictional stir additive manufacturing head has a downforce ranging from about 1000 psi to about 5000 psi. 
     
     
         3 . The method of  claim 1 , wherein the frictional stir additive manufacturing head has a rotational speed ranging from about 200 RPM to about 300 RPM. 
     
     
         4 . The method of  claim 1 , wherein the sacrificial anode has a higher electronegativity than the metal component of the part where the change in standard reduction potential between the sacrificial anode and the metal component ranges from about 0.3V to about 3.0V. 
     
     
         5 . The method of  claim 1 , wherein the sacrificial anode is a metal selected from the group consisting of magnesium, aluminum, zinc, chromium, iron, copper, steel, and alloys thereof. 
     
     
         6 . The method of  claim 1 , wherein the metal component of the part is at least a portion of a mechanical or electrical object. 
     
     
         7 . The method of  claim 1 , wherein the metal component of the part is a metal selected from the group consisting of magnesium, aluminum, zinc, chromium, iron, copper, steel, and alloys thereof. 
     
     
         8 . The method of  claim 1 , wherein the printing includes printing a new sacrificial anode onto an existing or depleted sacrificial anode. 
     
     
         9 . The method of  claim 1 , further including printing an intermediate metal layer prior to printing the sacrificial anode, thereby attaching the intermediate metal layer to the metal component of the part with the metallic bond and attaching the sacrificial anode to the intermediate metal layer with a second metallic bond.