Abstract
Phosphophyllite crystals on cold-rolled steel and hopeite crystals on galvanized annealed steel were formed under various conditions of zinc phosphate solution composition and treatment time. Growth of both crystals was controlled by the solution composition and the surface conditioning. In particular, crystal formation was observed at an early stage and the crystal size was fine for zinc phosphate crystals from solutions containing Mn 2+. Polarization curves were obtained and analysed for the electrochemical evaluation of these crystalline layers. Results depended on the surface treatment time and the zinc phosphate crystal size. The cathodic current density i c was lowered and the absolute value of ∂ E c/∂ E c was increased by increasing the treatment time and with finer crystal size. Hence, the effectiveness of this method was established.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
