CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...

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-- SULFURIC ACID HASTELLOY® alloy B-2 has outstanding resistance to pure sulfuric acid. Even in the 70 to 80 percent acid concentration range, where other alloys have significantly higher rates, alloy B-2 exhibits good resistance. It has a corrosion rate of less than 5 mpy (0.13mm/yr) over a wide range of temperatures. Alloys C-276 and C-22 have acceptable rates over a relatively extensive range of concentrations and temperatures. HASTELLOY alloys G-3 and G-30 behave similarly to alloys C-276 and C-22, but in dilute acid applications « 30 percent) the former alloys rates are slightly lower. HAYNES alloy No. 25 is resistant to sulfuric acid in all concentrations at room temperature. At 150 deg. F (66 deg. C) it can be used in concentrations up to 60 percent. (See page No. 87.) ~. :. Chloride contamination of sulfuric acid tends to increase the rate of attack at all acid concentrations for HASTELLOY alloys B-2, and C-276, but has a lesser effect on alloys G-30 and G-30. ISO<strong>CORROSION</strong> DIAGRAM* HASTELLOY® Alloy B-2 Resistance to Sulfuric Acid 400 Corrosion rates in parentheses are in mm/year. I I Over 50 mpy (Over 1.27) 200 LL 350 300
ISO<strong>CORROSION</strong> DIAGRAMS· HASTELLOY® Alloy B-2 Resistance to Sulfuric Acid with 200 ppm Chloride Ions ( 400 Corrosion rates in parentheses are in mm/year. 200 350 u.. 0 300 w 0 W a: ~ 250 f-
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OUR NEW NAME Haynes International,
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COMPARATIVE CHEMICAL COMPOSITIONS,
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Type 316 Concen- Temperature HASTEL
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Type 316 Concen- Temperature HASTEl
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Page 63 and 64: ISOCORROSION DIAGRAMS· HASTELLOY®
Page 65 and 66: ISOCORROSION DIAGRAMS* HASTELLOY®
Page 69 and 70: ISOCORROSION DIAGRAMS· r HASTELLOY
Page 71 and 72: PHOSPHORIC ACID ISOCORROSION DIAGRA
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Page 79 and 80: ACETIC AND FORMIC ACIDS Acetic and
Page 81 and 82: EFFECT OF TEMPERATURE ON PITTING RE
Page 83 and 84: CREVICE-CORROSION DATA IN 10% FERRI
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Page 87 and 88: TYPICAL PENETRATION RATES IN CORROS
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