quote:The miltary is trying to get rid of cadmium too. When I retired 6 years ago it was almost completely out of new close combat vehicle (tanks, etc) design. I can't think of anyplace it was being used in new work on ground vehicles, don't know how completely they have gotten rid of it in new aerospace work but expect they are being strongly encouraged to avoid it.
Cadmium is a cancer-causing agent (Carcinogen). However, Cadmium has many desirable properties: 1. Corrosion protection it is an active metal, and it provide sacrificial corrosion protection. It is still used for military and aerospace applications (not much for civilian use due to its toxicity).
quote:That was one of the problems in getting rid of it. The lubricity is different enough that critically torqued fasteners really should have different torque callouts depending on whether they have cad or zinc plating. The problem is compounded by the fact that once fasteners are in the military inventory, there is no way to tell cad plated from zinc plated fasteners. Eventually it was decided that the problem was too difficult to solve so was ignored. There haven't been many problems.
3. Lubricity the metal itself is slippery, if you rob your finger again the metal, you can feel this property. This is excellent when come to installation, say push bearing into its housing, thread in parts, etc.