Overall corrosion of nickel and its corrosion resistant alloys in high temperature HCI gas

The characteristics of HCI are similar to those of dry CI. There is also a critical temperature that causes the corrosion rate of metal materials to increase sharply. For some corrosion test data, see Table 2-27, Table 2-28, and Table 2-29. Combining these corrosion data, it can be considered that pure nickel and NiAl4 containing 4% Al have the best corrosion resistance in high-temperature HCI gas. In this high-temperature gas, Monel 400 and stainless steel do not have suitable corrosion resistance. During the chemical process using high-temperature HCI gas, avoid HCI condensation in the equipment or process piping. Failure to do so will result in severe corrosion of the equipment and piping materials by the HCI acid formed by condensation of HCI gas.

2-27 Corrosion of Some Metallic Materials in Dry HCI

 

Grade Short-term experiments in dry HCI with corrosion rates exceeding the approximate temperatures for a given corrosion rate Temperatue /ºC
0.76mm/a 1.52mm/a 3.05mm/a
Ni201 454 510 565 510
600 426 482 538 482
C-276 371 426 482 452
316 stainless steel 371 371 482 426
304 stainless steel 343 399 454 399
Carbon 260 315 399 260
Monel 400 232 260 343 232
Cu 93 149 204 93

2-28 Corrosion of Some Nickel Base Alloys and Stainless Steels in Anhydrous HCI

Grade Temperature/ºC time/h corrosion average rate/ mm﹒a⁻¹
Ni201 498 50 0.08
600 498 500 0.08
304 stainless steel 498 500 0.26

2-29 Corrosion Test Results of Nickel-based Corrosion Resistant Alloys in High-temperature HCI Gas 96

Grade 400ºC 450ºC
corrosion average rate/ g﹒(m²﹒h)⁻¹ Intergranular corrosion corrosion average rate/ g﹒(m²﹒h)⁻¹ Intergranular corrosion
Ni200 0.097~0.152 none 0.109~0.249 have
high purity Ni 0.075 none 0.129~0.343 have
monel 400 0.37 / 1.372 none
NiAl₄+Ce 0.063 none 0.111 none
NiAl₄ 0.108 none 0.164 none
NS 3301 0.222 / / /
NS 1401 0.216 / / /

Post time: Apr-27-2018
-->

INQUIRY DETAILS *

INQUIRY NOW
  • captcha