Experimental Investigation of the Corrosion Behavior of Friction Stir Welded AZ61A Magnesium Alloy Welds under Salt Spray Corrosion Test and Galvanic Corrosion Test Using Response Surface Methodology

Table 5

ANOVA test results for salt spray corrosion test.

Source	Sum of squares	df	Mean square	𝐹 value	𝑃 value	Prob > 𝐹
Model	126.60	9	14.07	31.30	<0.0001	Significant
𝑃	49.03	1	49.03	109.11	<0.0001
𝑇	10.55	1	10.55	23.48	0.0007
𝐶	9.12	1	9.12	20.29	0.0011
𝑃𝑇	1.83	1	1.83	4.08	0.0710
𝑃𝐶	0.047	1	0.047	0.10	0.7543
𝑇𝐶	0.033	1	0.033	0.072	0.7934
𝑃^2	37.07	1	37.07	82.48	<0.0001
𝑇^2	3.4𝐸−004	1	3.4𝐸−004	7.6𝐸−004	0.9785
𝐶^2	23.17	1	23.17	51.55	<0.0001
Residual	4.49	10	0.45
Lack of fit	2.82	5	0.53	1.69	0.2893	Not significant
Pure error	1.67	5	0.33
Cor total	131.09	19