CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...
CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...
CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...
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<strong>CORROSION</strong> <strong>RESISTANCE</strong> <strong>OF</strong><br />
HAYNES® ALLOY NO. 25 AND MULTIMET® ALLOY<br />
NOTE: The figures in the following tables were determined in laboratory tests,<br />
using ordinary laboratory reagents in glassware. As it is impossible to<br />
duplicate plant conditions by laboratory tests, it is obvious that these results<br />
cannot be translated directly into plant performance. However, they will serve<br />
as a guide for selecting an alloy for an application.<br />
All results are expressed in mils (mm) penetration peryear. Acid strengths<br />
are given in percent by weight. In some instances, no measurable penetration<br />
could be observed. These instances are noted by the word, "Nil." All data are<br />
steady-state as calculated from a minimum of five 24-hr. test periods.<br />
All data were obtained using corrosion specimens prepared from 12-gage,<br />
solution heat-treated sheet.<br />
TYPICAL PENETRATION RATES IN CORROSIVE MEDIA, Mils (mm) Per Year<br />
ACETIC ACID CHROMIC ACID FORMIC ACID<br />
10%<br />
99% 2% 20% 10% 89%<br />
HAYNES alloy No. 25<br />
Room Nil Nil Nil Nil Nil Nil Nil<br />
0.1<br />
-<br />
0.1 0.1 0.1<br />
«0.01) «0.01) «0.01) « 0.01)<br />
150 deg. F<br />
Nil Nil Nil<br />
5.0<br />
Nil<br />
21<br />
0.1<br />
Nil<br />
- Nil Nil<br />
0.1<br />
(66 deg. C) (0.13) (0.53) «0.01) «0.01)<br />
Boiling<br />
0.1 0.1<br />
3.0<br />
Nil<br />
41 165 8.0 10<br />
- 15 20 6.0<br />
«0.01) «0.01) (0.08) (1.04) (4.19) (0.20) (0.25) (0.38) (0.51) (0.15)<br />
MULTIMET alloy<br />
Room Nil Nil Nil Nil Nil Nil Nil<br />
0.1<br />
-<br />
0.1 0.1<br />
«0.01) «0.01) «0.01)<br />
Nil<br />
150 deg. F<br />
Nil Nil Nil<br />
8.0<br />
Nil<br />
91<br />
0.1<br />
(66 deg. C)<br />
Nil<br />
(0.20) (2.31) «0.01)<br />
-<br />
Nil<br />
0.1<br />
« 0.01)<br />
Nil<br />
Boiling<br />
0.1 0.1 0.1 6.0 358* >1000 4.0 6.0<br />
-<br />
8.0 6.0 3.0<br />
«0.01) «0.01) «0.01) (0.15) (9.09) (>25.4) (0.10) (0.15) (0.20) (0.15) (0.08)<br />
*Rate is for the fifth (24-hour) test period, not steady state rate.<br />
CUPRIC CHLORIDE<br />
FERRIC CHLORIDE<br />
5% + 10% + 5% +<br />
2% 10% NaCI 10% NaCI 2% 10% NaCI 10%<br />
HAYNES alloy No. 25<br />
Room<br />
Nil<br />
0.2<br />
«0.01)<br />
Nil<br />
Nil<br />
150 deg. F<br />
(66 deg. C)<br />
Nil Nil Nil Nil Nil<br />
Boiling<br />
MULTIMET alloy<br />
0.1 0.5<br />
«0.01) «0.02)<br />
Nil<br />
Room Nil Nil Nil Nil<br />
150 deg. F 160<br />
193 >1000<br />
Nil<br />
Nil<br />
(66 deg. C) (4.06) (4.90) (>25.4)<br />
..../<br />
Boiling<br />
919 >1000<br />
>1000<br />
(23.3) (>25.4) (> 25.4)<br />
*Rate is for the fifth (24-hour) test period, not steady state rate.<br />
85
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