Effect of pyridine on the electrocrystallization and corrosion behavior of Ni-W alloy coated from citrate-ammonia media

► Ni-W-Pyr coatings were homogeneous with finer grain size with dendrites. ► Ni-W-Pyr contains about 11% of W when it is only 0.1% for Ni-W coatings. ► Ni-W-Pyr deposits improve electrical, mechanical and electrochemical properties of Cu. ► Ni-W films obtained from pyridine bath improved better stability into 3% NaCl. ► Pyridine has been not only adsorbate onto the Ni-W layer but also through it.