In this paper, a method to deodorize ammonia and formaldehyde generated in a foundry using an aqueous solution of hypochlorous acid is reported. Air containing ammonia or formaldehyde was absorbed by an aqueous solution of hypochlorous acid, and the concentration of ammonia and formaldehyde before and after absorption, the type of ions in the solution, and the concentration of residual chlorine were measured. The results revealed that ammonia and formaldehyde deodorized upon oxidation in an aqueous solution of hypochlorous acid. However, the oxidation of formaldehyde with hypochlorous acid was only efficient in the presence of an adsorbent. The results have revealed the possibility of reducing foundry odors using a hypochlorous acid solution.
The relationship between machinability, addition of inoculants and solidification structure has been investigated by measurement of cooling curves, observation of microstructures and cutting tests for FC250 flake graphite cast irons which have different morphology of graphite and matrix structure fabricated by Fe-Si and C-series inoculants. The D-type graphite has been observed in the Base (inoculant-free) alloy, and A-type graphite appeared in alloys which have included higher contents of inoculants. The width of flank wear of each alloy was decreased with increasing of cutting force, while the cutting temperature was increased with increasing of cutting force. The width of flank wear of each alloy has been also increased with increasing of area fractions of graphite and ferrite, although the width of flank wear has been decreased with increasing of area fractions of perlite. The surface of flank of Al 2 O 3 coated tool has been observed by scanning electron microscope (SEM), and some compounds including Si was confirmed on that surface. Those compounds probably are formed during cutting, and wear of cutting tool has been accelerated, even in the case of low cutting force.
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