55:T61b,TABLE 6. Velocity Guidelines for Copper Alloys in Pumps and Propellers Operating in Seawater UNS Number Peripheral Velocity feet/second meters/second C83600 _ _ _ _ __ _ _ _ d O <9.1 C87600 _ _ _ _ _ _ _ _ _ <30 <9.1 C90300 _ _ _ _ _ _ _ _ _ <45 <13.7 C92200 _ _ _ _ _ _ _ _ _ <45 <13.7 C95200 _ _ __ _ __ C86500 _ _ _ __ _ _ <75 <22.8 _ _ _ _ <75 <22.8 C95500 _ _ _ _ _ _ __ _ _ _ _ _ _ _ , 75 >22 .8 Unshaded areas", standard U.S. units Shaded areas = metric units (51) E 1.0 0. 0. ~ ~ ~ Q) e> '" .c " "' 0.100 is ." • I'-.. w. -0-., Q; 0. 0. 0 () ~ 0.010 , f- Background 10 1 Time after startup .. 10' intake I, water . 10' .) .. . . 10' 1hr • I ~opper 0.001 , 75 '22.8 C9S700 _ _ _ _ _ _ _ _ _ , 75 >22 .8 C9S800 _ __ 10.0 1 day 10' Minutes 1wk 1mo3mo FIGURE 11-1. Formation Rate of Corrosion Film on 90-10 Copper-Nickel in Seawater. Source: G. Butler and A. D. Mercer, Nature, Vol. 256, No. 5520, pp 179-720. See also: Copper-Nickel Alloy-Resistance to Corrosion and Biofouling in the Application of Copper-Nickel Alloys in Marine Systems, available from Copper Development Association Inc. Time, years 2 6 4 8 14 12 10 o Quiet 50 E ~40 E o Flowing • Tidal .3"' 30 .04 mpy _ :E '" ~ 20 10 ~ ,05mpy--, .-- ~ . • o ______ a ~ ______ ~ ______ 2 ~ ______ 3 ~ ______ 4 ~ __ ~ 5 Time , days x 103 FIGURE 11-2. Weight Loss-Time Curves for 90-10 Copper-Nickel In Seawater. Source: International Nickel Co., Inc., Marine Corrosion Bulletin MCB-1 , 1975. 6156:T564,VOLTS : SATURATED CALOMEL HAlF-CEl REFERENCE ELECTRODE , 6z1 o , M'agnesium , P , ~ Beryllium .--l-_...L-I I Aluminum Alloys cldm'n~m I I Mild Steel, Cast Iror I I Steel I Low Alloy I I I Austenitic Nickel Cast Iron Iq I I I Alu,min+Br+e Navel Brass, Yellow Brass, Red Brass 19 OTir I D Copper rL--. I I W Pb-Sn Solder (50-50) I I I I Admiralty Brass, Aluminum Brass I I I Maganese Bronze Silicbn Br6nze I I I Tin Bronze (G & M) o o O P b I ~ ISta