The　microstructures,　the　surface　morphology　and　the　composition　of　nanocrystalline　Ni　and　nanocrystalline　Ni-Co　alloy　prepared　by　pulse　electrodeposition　have　been　studied　by　XRD,　SEM　and　EDS.　The　corrosion　behaviors　of　nanocrystalline　nickel　and　Ni-Co　alloys　in　the　solutions　containing　305%　(mass　fraction)　NaCl　and　5%　(mass　fraction)　were　investigated　by　soak　method　and　electrochemical　polarization　method　respectively.　The　experimental　results　indicate　that　typical　nanocrystalline　nickel　and　Ni-Co　alloy　coatings　can　be　synthesized　by　pulse　electrodeposition,　and　the　alloying　element　Co　had　an　effect　of　solution　strengthening　and　grain　size　refinement.　The　nanocrystalline　Ni-Co　alloy　is　dense　in　nature　and　it　exhibited　better　corrosion　resistance　in　3.5%　(mass　fraction)　NaCl　solution　and　5%　(mass　fraction)　HCl　solution　than　the　nanocrystalline　nickel.　The　surface　morphology　of　all　samples　after　corrosion　in　3.5%　(mass　fraction)　NaCl　solution　show　good　corrosion　resistance,　however,　the　samples　were　uniformly　corroded　in　5%　(mass　fraction)　HCl　solution.　©　2009,　Northwest　Institute　for　Nonferrous　Metal　Research.　Published　by　Elsevier　BV.　All　rights　reserved.