Nickel Insitute - Nickel Alloys in Organic Acids & Related Compounds
TABLE XLV
TABLE XLVII
Corrosion of Stainless Steel in a Propionic Acid-Anhydride Mixture
Corrosion of Proprietary Alloys in 2-Ethyl Butyric Acid
Duplicate specimens exposed for 48 hours or longer in refined boiling acid without aeration or deaeration.
Conditions: Specimens exposed in pressure equipment at 260 ºC (500 ºF) and 300 atmospheres pressure from 4 to 7-hour periods in a 65% propionic acid/35%propionic anhydride mixture with continuous feed of two liters/ hour.
Corrosion Rate
Alloy
mm/y
mpy
Corrosion Rate
.03 .05 <.03 .89 .18 .28 .03 <.03 .03 5.33 <.03
1 2
Type 316 Stainless Steel CRUCIBLE alloy 223 Titanium WAUKESHA 23 WAUKESHA 54 WAUKESHA 88 KROMARC 55 E-BRITE 26-1 CRUCIBLE 26-1 CROLOY 16-1 CARPENTER alloy 20Cb-3
Alloy
Liquid
Vapor
mm/y mpy mm/y
mpy
<1 35 7 11 1 <1 1 210 <1
129.41 141.86
5095 5585
80,01 78.10 116.84
3150 3075 4600
Type 430 Stainless Steel Type 304 Stainless Steel Type 347 Stainless Steel Type 316 Stainless Steel Type 316 Stainless Steel (Sen.)
3.63 9.91 12.01
143 390 475 179 313 286
7,09 4.01 2.44 7.65 8.36
279 158 96 301 329
Type 317 Stainless Steel Type 318 Stainless Steel CARPENTER alloy 20
4.55 7.95 7.26
TABLE XLVI
Corrosion of Alloys in Higher Organic Acids
Conditions: Laboratory tests for 48 hours at temperatures shown in refined (99.9+) acids.
Corrosion Rate
Acid (Approximate
Test
Silicon Bronze
Type 304 Stainless Steel
Type 316 Stainless Steel
Carbon Steel
Copper
boiling point)
Temperature
ºC
ºF mm/y mpy mm/y mpy mm/y mpy mm/y mpy mm/y mpy
Acetic (116 ºC or 240 ºF)
26 78.8
2.79 5.33
110 210
.28 .08 .05
11
.41 .08 .15
16
<.03
<1 10 <1 <1 45 <1 <1 <1 21 5
<.03
<1
116
240
3 3
3 6
.25
.08
3
.71
28 78
<.03
<.03 <.03 <.03 <.03 <.03 <.03 <.03 .10
<1 <1 <1 <1 <1 <1 <1 4
Propionic (140 ºC or 284 ºF)
26 78.8
110
240
1.98
2.13
84 Nil
3.40
134
.13
.15
6 – 2
Nil
.05
2 – 2 5 1 9
<.03 1.14 <.03 <.03 <.03
Butyric (163 ºC or 325 ºF)
26 78.8
163
325
–
–
– 2
–
.05
.05
.05 .13 .03 .23
Valeric (185 ºC or 365 ºF)
26 78.8
140
284
1.37
54
2.06
27
.18 .86
7
.03 .41
1
2-Ethylbutyric (190 ºC or 374 ºF)
26 78.8
150
302
34
16
.53
2-Methylpentanoic (195 ºC or 383 ºF)
.03 .53
1
.08 .30
3
.10 .08
4 3
<.03 <.03
<1 <1
<.03 <.03
<1 <1
26 78.8
150
302
21
12
2-Ethylhexanoic
.03
1
<.03 <.03
<1 <1
<.03 <.03
<1 <1
<.03
<1
<.03 <.03 <.03 <.03 <.03 <.03
<1 <1 <1 <1 <1 <1
(220 ºC or 428 ºF)
26 78.8
190
374
1.27
50
.20
8
.03 .89 .03 .84
1
05
2
.03
1
<.03
<1 17 <1
Iso-octanoic (240 ºC or 464 ºF)
26 78.8
190
374
35 <1 33
<.03 <.03 <.03
<1 <1 <1
<.03 <.03 <.03
<1 <1 <1
.43
<.03
Iso-decanoic (265 ºC or 509 ºF)
26 78.8
.20
8
190
374
Reference 5
Page 42
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