Description

Magnesium Anode Standard Potential Magnesium Anodes In average soil conditions, H*1 alloy, commonly known as standard potential magnesium, is an excellent choice for use in cathodic protection systems. Typically, CORRTECH H*1 anodes produce a minimum open circuit potential of 1.*2 volts with respect to Cu-CuSO4. Therefore, the driving potential of the H*1 cathodic protection anodes exceed that of aluminum or zinc, but is still lower than a high potential magnesium anode. We suggest using CORRTECH Standard Potential Magnesium Anodes in soils with resistivity lower than ***0 Ω/cm to minimize the cost, as this kind of anodes are much cheaper than high potential magnesium anodes. Chemical composition (%) Alloy Al Zn Mn Si (max) Cu (max) Ni (max) Fe (max) Total of impurities (max) AZ*3B 5.***6.*0 2.***3.*0 0.***0.*0 0.*8 0.*1 0.**1 0.**3 0.*0 AZ*1D 2.**3.5 0.**1.4 0.**1.0 0.*8 0.*1 0.**1 0.**2 0.*0 AZ*3C 5.***6.*0 2.***3.*0 0.***0.*0 0.*0 0.*5 0.**3 0.**3 0.*0 Electrochemical properties Open voltage(-V) Closed voltage(-V) Actual capacity(A.h/kg) Efficiency (%) 1.***1.*5 1.***1.*0 1, **0 min *5 min Mg High Potential Anode CORRTECH Magnesium High Potential Anode is manufactured from high quality, primary magnesium under strict, state of the art production techniques, anode chemistry, testing and certification according to ASTM****9 standard. For these reasons, CORRTECH Magnesium High Potential Anode meets or exceeds industry standards for high potential Mg anodes and has a longer life. As normally required, the anode is packaged in a cloth bag with a prepared backfill mixture that works to maintain moisture around the anode and lowers the anode to earth resistance. For farther information of packaged Mg anodes, please call CORRTECH. Chemical composition (%) Alloy Al Mn Cu Si Fe Ni Other metal impurity (max) Total of impurities (max) (max) (max) (max) (max) (max) Mg-Mn 0.*1 0.***1.*0 0.*2 0.*5 0.*3 0.**1 0.*5 0.3 As per ASTM B**3 Industry Standard for M1C high potential magnesium anodes. Electrochemical properties Open voltage(-V) Closed voltage(-V) Actual capacity (A.h/kg) Efficiency (%) 1.***1.*5 1.***1.*2 1, **0 min *0 min Mg Extruded Rod Anodes Extruded anodes have high current to weight ratio, are suitable to be used in where a small diameter anode is required to give enough cathodic current. CORRTECH supplies extruded anodes in both high potential (Mg-Mn alloy) and low potential (AZ*1 alloy). CORRTECH&#**9;s extruded anodes are typically suitable for all kinds of water heaters and water storage tanks, or in prepolarization of offshore structure etc. Chemical composition (%) Alloy Al Mn Zn Ca Si Cu Ni Fe Other Imp. (max) (max) (max) (max) (max) (max) each total AZ*1B 2.**3.5 0.**1.0 0.**1.4 0.*4 0.1 0.*3 0.**5 0.**5 **- 0.3 AZ*1D 2.**3.5 0.**1.0 0.**1.4 0.*4 0.*5 0.*1 0.**1 0.**2 0.*1 0.3 Mg-Mn 0.*1 max 0.**1.3 **- **- **- 0.*2 0.**1 0.*3 0.*5 0.3 Specification Diameter Core eccentric Core diameter Straightness Weight (inch) (inch) (inch) (inch/ 2 ft length) (lbs/inch) 0.****0.**0 0.**0 0.**5 0.*6 0.**5 0.****0.**0 0.**0 0.**5 0.*6 0.**5 0.****0.**0 1/*6 0.**5 0.*6 0.**7 0.****0.**0 1/*6 0.**5 0.*4 0.**1 0.****0.**0 1/*6 0.**5 0.*4 0.**5 0.****0.**0 1/*6 0.**5 0.*4 0.**8 0.****0.**0 1/*6 0.**5 0.*4 0.**3 1.****0.**0 1/*6 0.**5 0.*4 0.**7 1.****0.**0 1/*6 0.**5 0.*4 0.**9 1.****0.**6 1/*6 0.**8 0.*5 0.**5 2.****0.**4 1/8 0.**8 0.*5 0.**8 2.****0.**4 1/8 0.**8 0.*5 1/3 Mg Extruded Ribbon Anode Mg Extruded ribbon anodes have much more surface to weight ratios, thus it will create greater current than normal cast anode. Mg extruded anodes are normally used for protecting oil tanks or other steel structure in high resistivity electrolytes. Chemical composition (%) Mg Mn Zn Al Cu Ni Fe Si Impurities (max) (max) (max) (max) (max) Each Total Balance 0.***1.3 ***- 0.*1 0.*2 0.**1 0.*3 **- 0.*5 0.*0 Balance 0.*0 min 0.**1.3 2.**3.5 0.*1 0.**1 0.**2 0.*5 0.*5 0.*0 General Specifications Section (inch) 3/8x3/4 *- 0.**5(1/8"corner) Diameter of core (inch) 0.**5 Core eccentric (inch) <1/*6 Weight (lbs/feet) 0.**3 Standard coil length (feet) ***0 Coil weight (lbs) **3 (**0kg) Application �Oil tanks �Pipeline and other kinds of steel structure Mg Cast Rod Anode AZ*3 alloy Mg cast rod anodes are normally use in protecting water heater from corrosion. CORRTECH adopts advanced casting technology, supplies quality Mg cast rod anode as follows: Chemical composition (%) Alloy Mg Al Zn Mn Si Cu Ni Fe Total of Impurities (max) (max) (max) (max) (max) AZ*3B Balance 5.***6.*0 2.***3.*0 0.***0.*0 0.1 0.*2 0.**2 0.**3 0.3 Electrochemical properties Open voltage (-V) Closed voltage (-V) Actual capacity (A.h/kg) Efficiency (%) 1.***1.*5 1.***1.*0 1, **0 min *5 min General Specifications A/mm B/mm kg/m Dia. of the steel core (mm) *4.0 2.0 0.*8 *6.0 2.0 0.*7 *9.1 3.4 0.*5 3.2 *1.3 3.4 0.*8 *6.7 3.4 1.*0 *3.4 3.4 1.*0 *9.6 4.8 2.*3 *1.4 4.8 3.*2 The diamond of steel core could be available according to customers� request. And we also could supply special product in accordance with the drawing from customers. Prepackaged Mg Anodes Above bare Mg anodes could be supplied after being prepackaged. The bare Mg anodes will be assembled with cable and sealed with epoxy resin, and packaged in cotton bag. As the prepackaged anodes are buried under the ground, if there is any harmful element in the backfill of prepackaged anodes, this element will leak to the earth and groundwater when the anode is used, which will pollute the environment. CORRTECH prepackaged anodes are made of recyclable materials or easily decomposable materials and the content of harmful elements in the backfill is lower than safety standards, which will not bring any pollution to the surrounding. The available cables type (insulation / sheath) are: PVC/PVC, XLPE/PVC, HMWPE with cable size: 6mmsq, *0mmsq, *6mmsq. Composition of Backfill � Gypsum: *5% � Bentonite: *0%, � Anhydrous Sodium Sulphate: 5% Harmful elements in backfill: Cd (max) As (max) Hg (max) Pb (max) 1ppm 1ppm 1ppm *0ppm