A typical surface morphological diagram and the enlarged view of NiCrBSi coating are shown in Figure 1(a-1,a-2), respectively. It can be seen that the APS sprayed coating is quite well spread, where molten or semi-melted particles compacted the substrate after spreading and solidification processes to form a lamellar structured coating. Figure 1(b-1,b-2) further disclose the surface morphology after acid accelerated corrosion by using HF-HNO3 solution. There are some unmelted spherical particles with the size of ～50 um in the coating. Additionally, partial flat particles form crystallized regions after deposition on the substrate. Both of which are prone to be corroded alongside the grain boundaries, resulting in textured surface composed of nano-crystallines, as shown in Figure 1(b-2). To be concluded, part of the uncorroded, smooth surface without fine grains distribution coexisted with the corroded, nano-crystallized region, where the smooth regions resistant to the acid are generally believed to contain higher amorphous content(See Part 2 of Supplementary Materials).
Figure 1. Typical surface view of (a) plasma sprayed NiCrBSi coating and (b) acid corrosion of plasma sprayed NiCrBSi coating.(a-1,b-1): low magnification,(a-2,b-2): high magnification.
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