CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...

Type
316
Concen- Temperature HASTELLOY~ alloy Staintration,
less
Corrosive Media percent deg. F deg. C 8/8-2 C/C-276 G/G-3 Steel Conditions
Silicon Tetrafluoride - 131 55 - E - G acid spray containing hydrofluoric acid, phosphoric acid, hydrofluosilicic
acid
Silicon Tetrafluoride - 167 75 - S - B acid spray containing phosphoric acid (69% Hl04, 50% P2O S ).
hydrofluosilicic acid, phosphate rock dust, water
Silicon Tetraiodide - 285·300 140-149 G - - - plus 2 percent free iodine under reflux half immersed
Silver Bromide 10 75 24 S - - -
Silver Chloride 10 75 24 - S - -
Silver Fines (Wet, Grey) - 212 100 B U - - very dilute FeCI] bleaching powder and muratic acid solution, aeration
none, agitation by boiling. Alloy C- 12 days
Silver Nitrate 10 75 24 S - - -
20 75 24 S - - -
40 75 24 S - - -
Silver Refining - 220 104 - E - E acid leach slimes of silver refinery containing Cu, Au, Ag, Se, Te, Pt and
Pd, moderate aeration
Silver Refining - 220 104 S· E E E acid leach slimes of silver refinery containing Cu, Au, Ag, Se, Te, PI and
Pd, ·specimen corroded away or was lost, aeration
Silver Salt - 70 21 - E - E possibly nitrate, aqueous solution; concentration unknown
Slurry 45 60 16 - - - B 100 mesh and finer, 2% H2S0 4 , saturated with S02, pH 1.0-1.5
Soap Coagulating - 100·125 38-52 S E - - strong NaCI solution plus dilute H2S04, rubber, soap and traces of aux·
Serum
iliary solution. Rubber contains 30 percent carbon black pH = 3.5 avg.
Alloy C= 0.17 mpy in conversion tank
Soap Fat - 465·480 240·249 E E - - steam, fatty acid, glycerol
Sodium Acetate 10 75 24 - S - -
Sodium Acid Fluoride 8 160 71 G U - - in agitated crystallizer
Sodium Acid Fluoride 8 140·180 60-82 S U - -
Sodium Acid Fluoride - 60·120 16-49 - B - - in manufacture of f1uosilicates. Alloy C= 20.3 mpy
Sodium Aluminate 10 75 24 S - - -
Sodium Bicarbonate 10 to B.P. to B.P. S S - -
20 11O·B.P. 43·B.P. S S - -
Sodium Bisulfate 20 180 82 - E - - treated under vacuum with sulfuric acid to drain off S02 contaminants.
Solution decomposed to Na2S04' Alloy C= 0.3 mpy
Sodium Bisulfate All to B.P. to B.P. S S - -
Sodium Bisulfite 3·6 - - - E - - in quebracho bisulfiting tanks. Alloy C= 0.1 mpy
Sodium Bromide All to B.P. to B.P. S S - -
Sodium Carbonate 10 to B.P. to B.P. S - - -
20 100·B.P. 38-B.P. S - - -
30 100-B.P. 38-B.P. S - -
100 1500 816 S - - -
Sodium Carbonate 1 100 38 - E - G Na2CO] 7·12 gil, NaHCO] 2-7 gil, NaCIO] 40 gil, NaOC15·10 gil, NaC110·
40 gil
Sodium Chlorate 55 230 110 - E - - plus 7 percent NaCI in vacuum evaporation in manufacture of NaCIO].
Alloy C = 0.1 mpy
Sodium Chlorate Saturated 160-240 71-116 - E - - sodium chloride solution plus 2-5 grams/liter of sodium hypochlorite.
Alloy C= 0.1 mpy
Sodium Chlorate - 70-220 21·104 - E - - in crystallizer saturated with NaC!. No hypochlorites present. pH = 6.7.
Alloy C= nil mpy
Sodium Chloride 0·10 107 42 - E - E brine solution waste stream containing 23 mg/l total dissolved solids consisting
of 10,000 mg/l chloride and 4,400 mg/l sulfate, pH 1.
Sodium Chloride 7 375 191 - E - - containing 53% NaCI, 198 days, slight attack under spacer
Sodium Chloride 10 75 24 S - - - manufacture of sodium fluosilicate, 3.5 percent H2SiF 6
Sodium Chloride 14 167 75 - E - - plus 2 grams/liter free chlorine. Alloy C= 0.001 mpy
Sodium Chloride 15 150 66 - E E E 10% calcium chloride; feed brine in potash extraction pilot plant
E- Less than 2 mpy (0.05 mmly)
B.P. - Boiling Point
G- 2 mpy (0.05 mmly) to 10 mpy (0.25 mm/y)
S - Over 10 mpy (0.25 mm/y) to 20 mpy (0.51 mmly)
B - Over 20 mpy (0.51 mmly) to 50 mpy (1.27 mmly)
U - More than 50 mpy (1.27 mmly)
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