In addition to removing rust, Electrolytic reduction cleaning (what I have been calling electrolysis) WILL remove chlorides (salt) from the artifact. The following paragraph is taken directly from the Nautical Archaeology Program, Texas A&M University (
http://nautarch.tamu.edu/class/anth605/File10a.htm) publication METHODS OF CONSERVING ARCHAEOLOGICAL MATERIAL FROM UNDERWATER SITES by DONNY L. HAMILTON. The last sentence says that chlorides are drawn from the specimen by electrolytic attraction.
The essence of the technique involves setting up an electrolytic cell with the artifact to be cleaned as the cathode. An electrolytic cell consists of a compartment or vat with two electrodes, the anode and the cathode, and contains a suitable electricity-conducting solution called the electrolyte. An electric current from an external direct current (DC) power supply is applied to cause oxidation and reduction. The anode is the positive terminal of the electrolytic cell, to which electrons, negatively charged ions, or colloidal particles, travel when an electric current is passed through the cell. Oxidation occurs at the anode and oxygen is evolved. The cathode is the negative terminal of an electrolytic cell, to which positively charged metallic ions travel. At the cathode, reduction takes place and hydrogen is evolved. In the reduction process, some of the positively charged metal ions in the compounds on the surface of the artifact are reduced to a metallic state in situ. In addition, chlorides and other anions are drawn from the specimen and migrate toward the positively charged anode by electrolytic attraction.
The tamu website contains lots of information about artifact preservation, but I find it overly complicated. A shorter description in laymans terms of the reasons for, and method to, build an electrlysis set-up is found at
http://pub10.bravenet.com/forum/786256373/fetch/900041 There are multiple other sites that describe how to build the system that can be located using google.
Fire Diver, if I am wrong in this please let me know.