CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...

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ISOCORROSION DIAGRAMS* HASTELLOY® Alloy C-22 Resistance to Phosphoric Acid LL 300
ISOCORROSION DIAGRAMS* HASTELLOY® Alloy G-30 Resistance to Phosphoric Acid ( Corrosion rates in parentheses are in mm/year. g Region of corrosion rate instability. (0.5) 20 mpy 150 ( LL cj 250 w o W 0: ~ 200 « 0: w Q... ~ ~ 150 Boiling Point Curve u cj w 0 W 100 0: I- :::::> « 0: w Q... ~ w I- 50 100 o 10 20 30 40 50 60 70 80 CONCENTRATION, WEIGHT PERCENT Comparison of HASTELLOY® Alloy G-30 and Alloy 625 in Commercial Phosphoric Acid* CORROSION RATE IN MM/YEAR 0.25 2.5 25 250 0 0 10.0 6 5.0 a c;> (') ....... L{) C\J CD (f) I W « .0: Z o (jj o 0: 0: o U LL o 4.0 0 0 cP6 3.0 0 00 0 2.0 60 Cb 1.0 OP 2 0 S t 6 P 2 0 S + 2000 ppm CIo P 2 0 S + 0.5% HF o f=«0: 1.0 10 100 1000 10,000 0.8 0.7 CORROSION RATE OF ALLOY 625 (MPY) The corrosion resistance of HASTELLOY alloy G-30 in a variety of environments is shown in this charI. The corrosivity of commercial phosphoric acid is a result of several variables such as concentration, temperature, impurity levels (manufacturer) and origin of the phosphate rock. Wide variations in corrosion rates are possible in acids of the same concentration but from different sources. Hence, corrosion tests were conducted in acids from a number of suppliers and the performance of alloy G-30 relative to alloy 625 is shown as a function of the corrosion rate of alloy 625. Within certain severity of the acid, alloy G-30 shows 2-3 times better corrosion resistance than alloy No. 625. In acids of high severity all the alloys exhibit corrosion rates in excess of 2.5mm/yr (100 mpy). •All test specimens were solution heat-treated and in the unwelded condition. 73
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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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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: 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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