CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...

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HYDROCHLORIC ACID HASTELLOY® alloy B-2 is 'particularly well suited for equipment handling hydrochloric acid at all concentrations and temperatures including the boiling point. It is important to note that corrosion behavior is affected by oxidizing chemicals. The presence of ferric or cupric ions in solution greatly accelerates attack, as can aeration of the hydrochloric acid. Even dissolved oxygen is sufficient to increase the corrosion rate for alloy B-2. " HASTELLOY alloy C-276 is resistant to all concentrations of hydrochloric acid at room temperature, and is used successfully up to about 120 deg. F (49 deg. C). Dissolved oxygen is not a strong enough oxidizer to passivate alloy C 276, and a decrease in rates is observed when oxygen is removed from the system. HASTELLOY alloys G-3 and G-30 have only limited usefulness in hydrochloric acid service. Acceptable corrosion behavior is exhibited in dilute concentrations, but at concentrations greater than 5 percent, the upper limit of utility is reduced to about 100 deg. F (38 deg. C). HAYNES® alloy No. 25 and MULTIMET® alloy are resistant to hydrochloric acid in all concentratrions at room temperature. (See page No. 86.) ISO<strong>CORROSION</strong> DIAGRAM* HASTELLOY® Alloy B-2 Resistance to Hydrochloric Acid 250 Corrosion rates in parentheses are in mm/year. 125 0-5 mpy, 100 u.. 0 C!J 200 5 mpy w (0.13) w 0 0 w I w a: a: => => l- I- e:{ 5-20 mpy 75 e:{ a: (0.13-0.51) a: w w a... a... ~ 150 ~ w w l- I- \ 100 ~ 5 mpy (0.13) 0-5 mpy (0-0.13) 0 10 20 30 40 CONCENTRATION, WEIGHT PERCENT \ 50 " •All test specimens were solution heat-treated and in the unwelded condition. 62
ISO<strong>CORROSION</strong> DIAGRAMS· HASTELLOY® Alloy B-2 Resistance to Hydrochloric Acid with 50 ppm Ferric Ions 250 Corrosion rates in parentheses are in mm/year. Boiling Point Curve 125 { ( :::> I-- (0.51-1.27) I-- e:{ 75 e:{ a: a: w w a.. a.. ~ ~ w 150 w I-- \ \ 5-20 mpy \ (0.13-0.51 ) 100 5mpy~ (0.13) 0 10 20 30 40 CONCENTRATION, WEIGHT PERCENT 50 I-- HASTELLOY® Alloy B-2 Resistance to Hydrochloric Acid with 100 ppm Ferric Ions 250 Corrosion rates in parentheses are in mm/year. Boiling Point Curve 125 20-50 mpy :::> I-- (0.51-1.27) I-- e:{ 75 e:{ a: a: w w a.. a.. ~ ~ w 150 w I-- 20 mpy I-- ____________ (0.51) \ \ 50 100 5-20 mpy (0.13-0.51 ) 'All test specimens were solution heat-treated and in the unwelded condition. 63 5 mpy / (0.13) 0 20 10 30 40 CONCENTRATION, WEIGHT PERCENT
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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 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 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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