Corrosion Properties of UNS N06110 for the CPI

摘要

UNS N06110 is a Ni-Cr-Mo alloy developed for service in highly corrosive environments. It has higher chromium content than the numerous other "C-type" alloys that have been developed in the last six decades. This higher Cr-content gives N06110 alloy greater resistance to oxidizing environments than is exhibited by other C-type alloys. In this paper, the corrosion-resistant properties of N06110 alloy in several severe environments pertinent to the Chemical Process Industry (CPI) are described. The corrosion rates of N06110 alloy are compared with those of Alloy 22 (N06022), Alloy 59 (N06059), Alloy 2000 (N06200), Alloy 686 (N06686), and Alloy 276 (N10276). The corrosion rate of N06110 alloy was measured in a wide range of solutions, including pure acids, mixed acids, oxides, sulfates, organics compounds, and salts. The data shows that N06110 alloy has an excellent corrosion resistance in many solutions, but is best suited for use in wet oxidizing or mildly reducing environments where it demonstrates superior performance in comparison to other Ni-Cr-Mo alloys. The corrosion performance of N06110 alloy in a mixed environment of sulfuric acid plus sodium chloride is discussed in detail. Unusual features of corrosion in this mixed environment are explored.