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Heritage Science

Table 1 EDS analysis of ALD coating removal

From: Protecting silver cultural heritage objects with atomic layer deposited corrosion barriers

 

100 nm Al2O3 ALD

140 nm Al2O3 ALD

0.05 wt% NaOH for 2 h

0.5 wt% NaOH for 25 min

Clear area (At %)

Hazy area (At %)

Clear area (At %)

Clear area (At %)

Hazy area (At %)

Clear area (At %)

Hazy area (At %)

Ag

34.27 ± 2.4

40.47 ± 2.5

4.64 ± 1.1

53.85 ± 2.6

47.16 ± 2.6

88.12 ± 2.7

88.36 ± 2.8

Cu

3.50 ± 0.3

6.12 ± 0.4

–

8.34 ± 0.5

7.23 ± 0.5

11.88 ± 0.5

11.64 ± 0.5

Al

5.70 ± 0.2

4.77 ± 0.2

17.47 ± 0.8

2.54 ± 0.1

3.67 ± 0.2

–

–

O

56.53 ± 3.4

48.65 ± 3.2

77.89 ± 5.0

35.27 ± 2.3

41.96 ± 2.8

–

–

  1. EDS analysis of Ag, Cu, Al and O in the clear and hazy ALD coating areas are shown for both concentrations of NaOH
  2. ALD coating removal was incomplete after removal with 0.05 wt% NaOH, as indicated by the presence of Al and O
  3. Complete coating removal was achieved with 0.5 wt% NaOH
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