CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...

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ISO<strong>CORROSION</strong> DIAGRAMS* HASTELLOY® Alloy G-30 Resistance to Sulfuric Acid Corrosion rates in parentheses are in mm/year. 200 Boiling Point Curve 1..L o ~ 300 u.i a: :::J I- ei 250 w Q... ~ w I- 200 150 "'""-- ~--- '- (0.13) 5 mpy (5) 200 mpy u o 150 ~ W a: :::J I « a: w Q... ~ 100 ~ 50 100 o 10 20 30 40 50 60 70 80 90 100 CONCENTRATION, WEIGHT PERCENT •All test specimens were solution heat-treated and in the unwelded condition. 78
ACETIC AND FORMIC ACIDS Acetic and formic acids are two of the more common organic acids. These acids are non-oxidizing in nature and all the Cabot Wrought Products Division alloys described offer good resistance. Corrosion problems often arise, however, because of the presence of impurities such as oxygen and halide ions. HASTELLOye; alloys B-2, C-276 and C-4, HAYNESB' alloy No. 25 and MULTIM ET® alloy have excellent resistance to acetic acid at all concentrations and tem peratures. Alloy No. 25 and MULTIMET alloy have excellent resistance to formic acid at room tem perature and 150 deg. F (66 deg. C). HYDR<strong>OF</strong>LUORIC ACID Hydrofluoric acid is one of the most corrosive chemicals. Corrosion is promoted by the presence of oxidizers in the acid solutions. Alloys with good corrosion resistance in HF solutions generally form a fluoride film and are therefore, susceptible to accelerated corrosion under conditions of high velocity. HASTELLOY alloys G, G-3 and C-276 have been used, successfully, as linings for hydrofluoric acid kilns. Alloy G also has been used for condenser tubes which handle the hydrofluoric gas after it leaves the kiln. Alloys C-276, G and G-3 have good resistance to abrasion and corrosion from sulfuric acid, fluorspar and hydrogen fluoride gas - even at high temperatures. (((I 79
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OUR NEW NAME Haynes International,
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COMPARATIVE CHEMICAL COMPOSITIONS,
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'A~0~A~~ Alloy / q,~ "'.>~~~Cfj 0.5
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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
Page 75 and 76: ISOCORROSION DIAGRAMS· HASTELLOY®
Page 77: ISOCORROSION DIAGRAMS* HASTELLOY®
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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