INVESTIGATION OF THE RESISTANCE OF CAST IRON TO HIGH-TEMPERATURE GAS CORROSION IN THE ENVIRONMENT OF ANODE GASES OF ALUMINUM ELECTROLYZERS

A study of the corrosion resistance of low-alloy cast iron in the environment of anodic gases of aluminum EcoSoderberg electrolyzers was carried out. During the experiments, cast irons not le-gated and alloyed with chromium, aluminum, together with chromium and aluminum were used. The studied samples and compositions of cast iron differ in chemical composition, the structure of the base, the form of carbon in the structure and the form of graphite. The duration of the experiment was 384 days. The corrosion resistance of cast iron was determined by the mass loss of samples and specific mass loss per unit surface per unit time. Of the studied compositions, cast iron containing a minimum amount of aluminum and chromium has the highest corrosion resistance. The mass loss of the samples was 33.8 %, and the specific loss was 1.71 · 10^–4 g/(cm²·h). The base of cast iron is ferrite-pearlite, graphite has a flake shape. Cast iron alloyed with aluminum in an amount of 0.64 % and alloyed with aluminum in an amount of 2.74 % and chromium 1.83 % has similar corrosion resistance indicators. The mass losses of the samples were 48.6 and 49.4 %, and the specific losses were 2.57 · 10^–4 and     2.51 g/(cm² · h), respectively. Graphite in such cast irons has a flake-like shape. Cast iron alloyed with aluminum in an amount of 5.51 % has relatively low corrosion resistance indicators, the weight loss of the samples was    64.4 %, and the specific loss was 3.22 · 10^–4 g /(cm² · h). Graphite in the structure of such cast iron has a lamellar structure. Minimum corrosion resistance is typical for cast iron samples with a chromium content of 1.83 %. 

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