I have found another alternative for removing rust from steel/iron objects recently when attending a Snap-On tool show. It is a product named Evapo-Rust and is available through your Snap-On dealer. It will remove rust and bluing or other oxide coatings. This does not harm copper, brass, aluminum, plastic, rubber or vinyl and does not remove non-oxide coatings, such as paint chrome or anodizing. They do warn not to use it on Cadmium coated surfaces.
If not hazardous contaminants are introduced, only the iron content of the solution should dictate the disposal method.
The part numbers are:
4D5 - 4x1 gallon case
5D5 - 5 gallon pail
30D5 - 30 gallons in a 55 gallon drum
55D5 - 55 gallon drum
There is also a rust inhibitor available, however I don't have the part number for that.
Some people are buying old car and motorcycle parts at yard sales and flea markets then treating them with these and reselling them for up to 10 times what they bought them for... I like it for cleaning railroad, mining and other artifacts.
This is also marketed through Orison Marketing in Abeline, TX who market maintenance, corroson and cleaning products and they have a web site at
www.orisonmarketing.com and have a toll free number 800-460-2423.
Joe