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Metals Corrosion Scale Corrosion of Base Metals in Contact Thesusceptibilityof differentbasemetalsto corrosionwhile corrosion is very high. Aluminum, being moreanodic metal, in contact, depends upon the difference between the con- will corrode in this combination. tact potentials, or the electromotive voltages of the metals tominusplusfromflowscurrentElectric As a general guideline, if the metals are half the length of involved. The greater the potential difference is, the greater the chartor more apart, the combination shouldbeavoided. is the tendency forattackofDirectioncorrosion. The metal with the higher Also, it is not a good idea to combine an anodic metal part potential forms the anode and is corroded. The larger the with thin cross section, such as thin wall tubing, with a separation distance in the electromotive chart between the cathodic or less anodic metal part of a heavy cross section, two metals in contact, the higher the contact potential and such as a fitting. chances for corrosion. For example, zinc and aluminum are veryshort distanceapartin the chart;thereforepotential for Example: A thin wall brass tube with steel fitting is a better, corrosion when these two metals are in contact is very low. although not ideal, combination than a thin wall steel tube On the other hand, aluminum and passivated 316 stainless with brass fitting. steel are far apart; hence, when in contact, the potential for Electromotive or Galvanic Series for Metals + Anodic Magnesium (least noble) Magnesium alloys Zinc (Parker steel fittings are zinc plated) corroded Berillium Aluminum 5052, 3004, 3003, 1100, 6053 Cadmium Aluminum 2117, 2017, 2024 Mild steel (1018), wrought iron, free machining steel (12L14) Low alloy high strength steel, cast iron Chrome iron (active) 430 Stainless (active) 302, 303, 321, 347, 410, 416, stainless steel (active) Ni-resist 316, 317 stainless steel (active) Carpenter 20Cb-3 stainless (active) Aluminum bronze (CA 687) Hastelloy C (active) Inconnel 625 (active) Titanium (active) Lead/Tin solder Lead Tin Inconnel 600 (active) Nickel (active) 60 Ni-15 Cr (active) 80 Ni-20 Cr (active) Hastelloy B (active) Naval brass (CA 464), Yellow brass (CA 268), Brass (CA360) Red brass (CA 230), Admiralty brass (CA 443) Copper (CA 102) Maganese bronze (CA 675), Tin bronze (CA 903, 905) 410, 416 Stainless (passive) Phosphor bronze (CA 521, 524) Silicon bronze (CA 651, 655) Nickel silver (CA 732, 735, 745, 752, 754, 757, 764, 770, 794) Cupro Ni 90-10 Cupro Ni 80-20 430 Stainless steel (passive) Cupro Ni 70-30 Hose,AirCoiledPTFEHydraulic&&Technical Nickel aluminum bronze (CA 630, 632) (Fleet)Truck Monel 400, K500 Tooling&FittingsThermoplastic&HosePneumaticAlphanumeric&DesignApprovalsHose Silver solder ProductsEquipment&AccessoriesTubingFittingsFit.&HoseInformationGuidesIndexAccessories Nickel (passive) 60 Ni 15 Cr (passive) Inconnel 600 (passive) 80 Ni 20 Cr (passive) Chrome iron (passive) 302, 303, 304, 321, 347 stainless steel (passive) 316, 317 stainless steel (passive) (Parker stainless steel fittings are passivated) Carpenter 20 Cb-3 stainless (passive), Incoloy 825 Silver Titanium (passive), Hastelloy C & C276 (passive), Inconnel 625 (passive) Graphic - Cathodic Zirconium (most noble) Gold protected Platinum Table U5 -- Electromotive or Galvanic Series for Metals 281 Parker Hannifin Corporation Parflex Division Ravenna, Ohio
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