A Chemical Treatment for Mercury Accidentally Spilled in Aircraft
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
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Tests were made to determine the susceptibility of commercially pure aluminium, and of high strength Al-Zn-Mg-Cu and Al-Cu alloys to embrittlement by mercury. Commercially pure aluminium to BS L16 is not embrittled by mercury. DTD 5050B Al-Zn-Mg-Cu is very susceptible to mercury embrittlement cracking occurred when the alloy was stressed in the short transverse direction at 5 of the 0.2 proof stress. DTD 5020A Al-Cu is more resistant to mercury embrittlement, although it cracked when stressed in the short transverse direction at 60 of the 0.2 proof stress. A Chemical technique using silver nitrate was developed to immobilise and render relatively harmless any elemental mercury accidentally spilled in aircraft. The corrosion and stress-corrosion hazards to alloys DTD 5020A and DTD 5050B, associated with silver nitrate and the products of its reaction with mercury, have been investigated.
- Properties of Metals and Alloys