Electrochemical, Isotherm, and Material Strength Studies of Cucumeropsis mannii Shell Extract on A515 Grade 70 Carbon Steel in NaCl Solution

Table 7

Type III ANOVA result for corrosion rate.

Source	Sum of Squares	df	Mean Square	value	value
Model	0.83089	9	0.09232	12.87092	<0.0001	Significant
-temperature	0.63577	1	0.63577	88.63545	<0.0001
-immersion time	0.05398	1	0.05398	7.52551	0.0125
-inhibitor concentration	0.08933	1	0.08933	12.45373	0.0021
	0.00592	1	0.00592	0.82552	0.3744
	0.03998	1	0.03998	5.57382	0.0285
	0.00129	1	0.00129	0.18018	0.6757
	0.00267	1	0.00267	0.37258	0.5485
	0.00136	1	0.00136	0.19021	0.6674
	0.00005	1	0.00005	0.00759	0.9314
Residual	0.14346	20	0.00717
Lack of fit	0.13366	5	0.02673	0.164891	0.5316	Not significant
Pure error	0.00979	15	0.00065
Cor. total	0.97434	29