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MIL-HDBK-506, DEPARTMENT OF DEFENSE HANDBOOK: PROCESS FOR COATING, PACK CEMENTATION, CHROME ALUMINID (10 APR 1998)., This process is one of many used by industry to provide a coating(s) on thoria dispersed (TD) nickel alloys to protect them against environmental oxidation, corrosion or erosion at high temperature operation. This military standard covers the procedure for the application and inspection of a chrome aluminide pack cementation coating on TD nickel alloys.