Test tube

Starting weight (gr)

Weight before to pickling (gr)

Weight after to pickling (gr)

Exposed surface (cm²)

Corrosion speed $\text{gr}/{\text{cm}}^{\text{2}}\cdot \text{year}$

1

111.40

125.21

124.30

61.28

0.042

2

112.514

126.32

125.36

62.18

0.044

3

139.25

155.19

154.05

76.24

0.043

4

74.048

81.29

81.00

43.60

0.019

5

137.44

151.58

150.62

47.11

0.058

6

122.169

134.53

134.19

52.51

0.018

7

117.738

129.01

128.69

50.32

0.018

8

82.69

91.20

90.20

58.70

0.049

9

72.84

80.33

79.28

49.78

0.060

10

90.60

99.92

98.82

61.50

0.051

11

111.2

123.15

122.13

60.74

0.0153

12

111.4

123.57

123.05

60.74

0.078