CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...

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ISO<strong>CORROSION</strong> DIAGRAMS* HASTELLOY® Alloy C-276 Resistance to Nitric Acid 300 Corrosion rates in parentheses are in mm/year. 150 u.. 0 (9 wo W a: ::::> I I-
PHOSPHORIC ACID ISO<strong>CORROSION</strong> DIAGRAMS· HASTELLOY® alloys B-2, C-276, C-22, G-3, G-30 and HAYNES® alloy No. 25 have acceptable corrosion resistance at most concentrations and temperatures. The maximum rates were observed in boiling 85 percent acid for all of these alloys. Commercial grades of phosphoric acid encountered during the production of wet process or superphosphoric acid quite frequently contain numerous impurities. These impurities, basically fluorides and ferric salts, serve to change the basic character of the acid. Alloys G-3 and G-30 have demonstrated excellent resistance to wide variety of acid compositions, presumably because of their high chromium contents. HASTELLOY® Alloy B-2 Resistance to Phosphoric Acid 350.-------,,-----,-------r-----r---,----.----,-------.-------, u.. 300 l- 75 e:{ a: w 0.... 2 w I- 50 0 10 20 30 40 50 60 CONCENTRATION, WEIGHT PERCENT 70 80 HASTELLOY® Alloy C-276 Resistance to Phosphoric Acid 350.-------r-------r----,----,----.----,-------.------,------, Corrosion rates in parentheses are in mm/year. u.. 300 l- e:{ a: w 0.... 2 w I- 50 100 o 10 20 30 40 50 60 CONCENTRATION. WEIGHT PERCENT •All test specimens were solution heat-treated and in the unwelded condition. 71
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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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Type 316 Concen- Temperature HASTEL
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Page 63 and 64: ISOCORROSION DIAGRAMS· HASTELLOY®
Page 65 and 66: ISOCORROSION DIAGRAMS* HASTELLOY®
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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
Page 85 and 86: CORROSION RESISTANCE OF HAYNES® AL
Page 87 and 88: TYPICAL PENETRATION RATES IN CORROS
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