| Alloy for use in galvanic protection -> Monitor Keywords |
|
|
 
Alloy for use in galvanic protectionAlloy for use in galvanic protection description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080107560, Alloy for use in galvanic protection. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001]The present invention relates to an alloy used in the galvanic protection of non metallic water vessels. BACKGROUND TO THE INVENTION [0002]In the marine industry the prevention of corrosion of components, such as metal fasteners, shaft and propeller components, constructed from stainless steel and bronze alloys is a primary concern. In aerated marine environments these materials are susceptible to crevice and pitting corrosion. Sacrificial anodes are commonly employed to provide cathodic protection to these components. Application of these sacrificial anodes on wooden and fibreglass vessels can result in an over protection, which may result in a reduced life of coatings and an enhanced level of marine growth and wood rot. [0003]The present invention seeks, therefore, among other things, to provide an alloy which overcomes some of the above mentioned disadvantages. SUMMARY OF THE INVENTION [0004]An alloy which comprises from 0.30 to 0.6 percent silicon plus or minus 5 percent, 0.1 to 0.30 percent iron plus Or minus 5 percent, 0.10 copper plus or minus 5 percent, 0.10 percent manganese plus or minus 5 percent, 0.35 to 0.6 percent magnesium plus or minus 5 percent, 0.05 percent chromium plus or minus 5 percent, 0.15 percent zinc plus or minus 5 percent, 0.10 percent titanium plus or minus 5 percent, 0.05 maximum individual trace metals plus or minus 5 percent, 0.15 percent total trace metals plus or minus 5 percent and the balance aluminium. BRIEF DESCRIPTION OF THE DRAWING [0005]In the drawing there is shown FIG. 1 which is a schematic side elevation of an anode formed of the alloy of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS [0006]In a preferred embodiment of the present invention the metallic components of a water vessel with a non-metallic hull are protected by connecting the alloy of the present invention and the metallic components of the water vessel to form an electrochemical cell. This electrochemical cell is created through the electrical connection of an anode formed of the alloy the present invention to a cathode which are the metallic components of a vessel. The cathode and the anode are both located in a bridging medium. The connection of the anode and the cathode in this way allows for the passage of electrons from the anode to the cathode. These electrons are generated through oxidation of species at the anode and reduction of species at the cathode. [0007]In a galvanic protection system the physical integrity of the anode is sacrificed in order to maintain the physical integrity of the cathode. The physical integrity of the anode is sacrificed through the dissolution of the anode into the bridging medium. The suitability of the anode for galvanic protection is determined by the electrochemical potential of the anode compared to the cathode and the capacity of the anode to protect the cathode. [0008]The alloy forming the anode has a chemical composition comprising 0.30 to 0.6 percent silicon plus or minus 5 percent, 0.1 to 0.30 percent iron plus or minus 5 percent, 0.10 copper plus or minus 5 percent, 0.10 percent manganese plus or minus 5 percent, 0.35 to 0.6 percent magnesium plus or minus 5 percent, 0.05 percent chromium plus or minus 5 percent, 0.15 percent zinc plus or minus 5 percent, 0.10 percent titanium plus or minus 5 percent, 0.05 maximum individual trace metals plus or minus 5 percent, 0.15 percent total trace metals plus or minus 5 percent with the balance being aluminum. [0009]The anode formed of the alloy of the present invention has an electrochemical potential more negative than that of the cathode, preferably with an electrochemical potential in the range of -500 to -1200 mV, more preferably with an electrochemical potential in the range of -500 to -1100 mV. [0010]The capacity of the anode to protect the cathode may be in the range of 1000 to 2000 Ah/kg, preferably in the range of 1400 to 1700 Ah/kg. [0011]The surface area of the anode 10 shown in FIG. 1 is increased trough the incorporation of ridges 12 on the surface of the anode. The surface area ratio of the anode to the cathode may be in the range of 1:1 to 1:20, preferably in the range of 1:2 to 1:20. [0012]The electrical connection provides a passage for the flow of electrons between the cathode and the anode. The electrical connection is preferably a metallic wire, more preferably a copper wire. [0013]The bridging medium provides a passage for the flow of electrons between the anode and the cathode. The bridging medium is preferably an aqueous solution, more preferably saltwater, particularly sea water. [0014]By applying an excess negative electrochemical potential applied across the cell the accumulation of excess calcium deposits, wood rot and paint disbondment may be prevented. This excess negative electrochemical potential is applied across the cell due to the differences in the electrochemical potential of the anode and the cathode. [0015]In an alternative embodiment of the invention, seawater as a bridging medium may be replaced with another suitable aqueous liquid, preferably brackish water or fresh water. [0016]The anode may be connected to the metallic components of the vessel using known techniques such as connecting the anode to the shaft gland/seal and, or shaft support bracket and, or the rudder and, or the trimtabs through a bonding buss bar/system via bonding wire. [0017]The anode of the present invention is particularly envisaged for use with water vessels with fibreglass or wooden hulls. [0018]Modifications or variations as would be apparent to a skilled addressee are deemed to be within the scope of the present invention. Continue reading about Alloy for use in galvanic protection... Full patent description for Alloy for use in galvanic protection Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Alloy for use in galvanic protection patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Alloy for use in galvanic protection or other areas of interest. ### Previous Patent Application: Austenitic stainless steel Next Patent Application: Medical fluid access site with antiseptic indicator Industry Class: Alloys or metallic compositions ### FreshPatents.com Support Thank you for viewing the Alloy for use in galvanic protection patent info. IP-related news and info Results in 0.12135 seconds Other interesting Feshpatents.com categories: Computers: Graphics , I/O , Processors , Dyn. Storage , Static Storage , Printers 174 |
 * Protect your Inventions * US Patent Office filing 
PATENT INFO |
|
