Overall corrosion of nickel and its corrosion resistant alloys in high temperature hydrogen fluoride

HF gas is a common medium for certain chemical processing. In high temperature hydrogen fluoride, Ni201, monel400, inconel 600, C-276 and 00Cr16Ni65Mo2Ti alloys all have suitable corrosion resistance, and have been successfully applied to practical engineering. Some corrosion test data are shown in Table 2-24 and Table 2-25.
Fig. 2-23 and Fig. 2-27 are corrosion test results of some corrosion-resistant alloys in high-temperature HF gas. Obviously, in various HF gases, Monel 400, NS 3301 (00Cr16Ni75Mo2Ti), and NS 3304 (C-276) three The best corrosion resistance of the alloy. However, in the HF above 600 oC, intergranular corrosion occurs in the Monel 400 alloy. In contrast, NS3301 and NS 3304 do not suffer from intergranular corrosion.
Note: In Figure 2-24, Figure 2-25, Figure 2-26, and Figure 2-27, the ratio of HF to H 2 O is the mass ratio, and the ratio of aqueous HF to air is the volume ratio.

2-24 Corrosion of Ni200 and Monel 400 in Mixture of Hydrogen Fluoride and Water Vapor

Grade corrosion average rate/ mm﹒a⁻¹
550ºC 600ºC 650ºC 700ºC 750ºC
Nickel 201 0.79 1.83 2.74 3.66 3.05
monel 400 / 0.61 1.52 3.96 5.18

2-25 Corrosion of Ni200 and Some Corrosion Resistant Alloys in Hydrogen Peroxide at 500~600oC

Grade time/h corrosion average rate/ mm﹒a⁻¹
C-276 36 0.0075
600 36 0.0175
200 36 0.225
201 36 0.35
400 36 0.325
K-500 36 0.4
70/30 Cu-Ni 36 0.4

Post time: Apr-27-2018
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