Table 4. The corrosion test of ordinary nails and conrete nails in wood extractive media

Code	Corrosion currents density (μA/cm2)	Corrosion potentials (μV)	Corrosion rate (μpy)
CM	55.00 ± 2.03	31.93 ± 1.37	3.74 ± 0.15
CK	73.26 ± 3.74	61.18 ± 1.77	0.72 ± 0.02
UM	473.85 ± 1.94	14.28 ± 0.51	1.96 ± 0.07
UK	467.65 ± 2.43	47.53 ± 1.85	0.65 ± 0.02