Characterization of Anodized Aluminum Alloy Al6061-T6 Under Simulated Leo Plasma Conditions

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Quantitative analysis of the sample after 1 h of plasma exposure

Element	Weight ℅	Atomic %
CK	13.23	16.28
OK	42.63	46.06
Al K	39.39	36.16
Si K	0.33	0.15
S K	4.42	1.35
Total	100	100

Calculated values of the plasma parameters

Parameters	Calculated values
Floating potential	7.5 V
Electron saturation current	19 × 10−5A
Electron temperature (Te)	3 eV
Electron density (ne)	4.47 × 106/cm3
Debye length λD	λD (cm) ≈ 0.61 (cm)

Maximum absorbance and reflectance values for the two samples

Condition	45 μm		25 μm
	Abs (max)	Ref (max)	Abs (max)	Ref (max)
Without the plasma effect	1.18935	50.4173	1.451	66.9496
Plasma exposure (1 h)	1.4533	51.9398	1.532	67.1468
Plasma exposure (2 h)	1.35128	51.962	1.486	71.105

Quantitative analysis of the sample with 2 h of plasma exposure

Element	Weight ℅	Atomic %
CK	12.86	15.81
OK	40.79	44.09
Al K	41.63	38.57
Si K	0.48	0.22
S K	4.24	1.31
Total	100	100

Quantitative analysis of the sample excluding plasma effects

Element	Weight ℅	Atomic %
CK	16.73	19.98
OK	45.72	50.16
Al K	32.27	27.78
Si K	0.51	0.23
S K	4.77	1.85
Total	100	100

Average surface roughness values for the two samples

Condition	Surface roughness (μm)
	Sample with a thickness of 45 μm	Sample with a thickness of 25 μm
Without plasma effect	1.8178	1.831
With plasma exposure (2 h)	1.2291	1.5157