CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...
CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...
CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...
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CREVICE-<strong>CORROSION</strong> DATA IN 10% FERRIC CHLORIDE<br />
AT ROO M TEMPERATURE FOR 10 DAYS<br />
Number of<br />
Maximum Depth<br />
Alloy Attacked of Penetration,<br />
Crevices* mils mm<br />
HASTELLOY® alloy C-276 0 0 0<br />
CABOT®<br />
alloy No. 625 11 3 0.08<br />
HASTELLOY alloy G-3 11 13 0.33<br />
HASTELLOY alloy G 16 17 0.43<br />
Type 317LM Stainless Steel 20 12 0.30<br />
Alloy No. 904L 23 19 0.48<br />
Type 317 L Stainless Steel 16 77 2.0<br />
20 Cb-3 aIloy 24 76 1.9<br />
Type 316 Stainless Steel 24 76 1.9 (Perforated)<br />
CABOT alIoy No. 825 24 125 3.2 (Perforated)<br />
'j<br />
·Maximum possible<br />
number of crevices was 24.<br />
MODIFIED WICK TEST DATA*<br />
Media --.<br />
Alloy<br />
t<br />
HASTELLOY@ alloy C-276<br />
1000 ppm Sodium Chloride and 500 ppm Ferric Chloride at 190 deg. F (88 deg. C) for 30 days<br />
General<br />
Corrosion<br />
None<br />
Average depth of Average depth of Stress-<br />
Crevice Attack, Pitting Attack, Corrosion<br />
mils (mm)** mils (mm)** Cracking<br />
One crevice at<br />
weld-2 (0.05)<br />
HASTELLOY alloy G None 3 (0.08) 3 (0.08) None<br />
Alloy 625 None 3 (0.08) 3 (0.08) None<br />
Alloy 825 Slight 8 (0.20) 8 (0.20) None<br />
None<br />
Type 316L Stainless Steel Heavy 18 (0.46) 18 (0.46)<br />
*In this test, a U-bend, stressed specimen is in contact with a wick material which is<br />
wetted by the media shown. The media evaporates from the specimen's surface during the test<br />
simulating wet/dry areas in a scrubber. In these areas, heavy deposits of scale and salts<br />
often are observed which promote localized corrosion.<br />
**Maximum crevice and pitting attack occurred at the salt line.<br />
None<br />
Cracked on<br />
both sides<br />
LOCALIZED <strong>CORROSION</strong> <strong>RESISTANCE</strong> IN PULP AND PAPER INDUSTRY ENVIRONMENTS<br />
Ammonia-Base Spent Sulfite Liquor*<br />
First Stage Bleach Unit Envlronment*<br />
pH = 1.9, CI- - 200 ppm, pH = 1.8, Ch + HCI + H 2 SO 4 ,<br />
T = 155 deg. F (69 deg. C) T = 95 deg. F (35 deg. C)<br />
Alloys Exposure - 246 Days Exposure - 258 Days<br />
Smooth Creviced Smooth Crevlced<br />
Areas Areas Areas Areas<br />
Type 31 6 Stainless Steel Pitting Crevice Attack Pitting Severe Crevice Attack<br />
Alloy 825 No Pitting Crevice Attack No Pitting Severe Crevice Attack<br />
HASTELLOY® alloy G No Pitting No Attack No Pitting Slight Crevice Attack<br />
CABOT ®alloy No. 625 No Pitting No Attack No Pitting Incipient Localized Attack<br />
HASTELLOY alloy C-276 No Pitting No Attack No Pitting No Attack i<br />
*Actual FieId Test Results, U-Bend Specimens T - Temperature<br />
83 I<br />
I~
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