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 6

ANOVA test results for galvanic corrosion test.

Source	Sum of squares	df	Mean square	𝐹 value	𝑃 value	Prob > 𝐹
Model	2.472𝐸−003	9	2.472𝐸−003	27.66	<0.0001	Significant
𝑃	9.229𝐸−004	1	9.229𝐸−004	92.93	<0.0001
𝑇	1.057𝐸−004	1	1.057𝐸−004	10.64	0.0085
𝐶	1.163𝐸−004	1	1.163𝐸−004	117.12	<0.0001
𝑃𝑇	4.642𝐸−005	1	4.642𝐸−004	4.67	0.0559
𝑃𝐶	4.700𝐸−005	1	4.700𝐸−005	4.73	0.0547
𝑇𝐶	5.634𝐸−005	1	5.634𝐸−005	5.67	0.0385
𝑃^2	2.804𝐸−005	1	2.804𝐸−005	2.82	0.1238
𝑇^2	6.470𝐸−005	1	6.470𝐸−005	6.51	0.0287
𝐶^2	3.072𝐸−005	1	3.072𝐸−005	3.09	0.1091
Residual	9.931𝐸−005	10	9.931𝐸−005
Lack of fit	6.999𝐸−005	5	1.400𝐸−005	2.39	0.1808	Not significant
Pure error	2.932𝐸−005	5	5.864𝐸−005
Cor total	2.572𝐸−005	19