Neither man gave anything away in a tight first round, in which the better work was being done by the Thai.
Zou led 2-1 going into the second and extended his advantage by a further point thanks to using tactics of avoidance while he picked his shots.
The Chinese fighter was constantly on the move and Pongprayoon was struggling to pin him down.
The Thai got the better of the final round and tagged his opponent with a few decent shots.
Zou was given a warning for pushing late in the third round, which seemed to give Pongprayoon the gold medal.
However, the referee evened matters moments later by giving Pongprayoon a warning.
It was not to matter in the end, as Zou went on to win 13-10.