Molybdenum chloride Subject

Inorganic salt solutions Molybdenum has excellent resistance to 3% sodium chloride, 10% aluminium chloride and 10% ammonium chloride at temperatures up to 100°C. It is severely corroded by 20% solutions of ferric and cupric chlorides at 35°C and is subject to pinhole-type pitting in mercuric chloride solutions (Table 5.5). 

Table 7.2 provides the chemical composition of this alloy. This is a low-carbon alloy with molybdenum added to improve chloride pitting resistance. It is virtually immune to chloride stress corrosion cracking. The alloy is subject to 885°F (475°C) embrittlement and loss of ductility at subzero temperatures. 

Type 317 stainless steel contains greater amounts of molybdenum, chromium, and nickel than type 316. The chemical composition is shown in Table 10.1. As a result of the increased alloying elements, these alloys offer higher resistance to pitting and crevice corrosion than type 316 in various process enviromnents encoimtered in the process industry. However, they may still be subject to chloride stress corrosion cracking. The alloy is... 

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