An investigation was conducted into galvanised and painted sheeting of Chinese origin.
Figure 1: Control SampleThe sheeting from the 45mm panel has a very thin coating on comparison to the control sample (Figure 2). Results of compositional analysis confirm that this coating is also an aluminium-zinc coating.
Figure 2: Sample from 45mm panelThe coating on the 25mm panel is cracked and has therefore not bonded properly to the iron substrate (Figure 3). The compositional analysis does not detect any aluminium in the coating.
Figure 3: Sample from 25mm panel