Fig. 8: SECM images of the tested specimens.

Among that, (a–c) represent to the scanned surface of 5A06 feedstock, AFSD and HHSAM in the feedback mode, and the tip potential in feedback mode was +0.51 V vs. SCE.

Among that, (a–c) represent to the scanned surface of 5A06 feedstock, AFSD and HHSAM in the feedback mode, and the tip potential in feedback mode was +0.51 V vs. SCE.