Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

Table 8

values of hydrogen for different steels obtained by literature.

Authors	Samples; (steel)	Effective diffusion coefficient ()
		(×10^−4 mm^2·s^−1)
		Time Lag	Breakthrough	Fourier
Haq et al., 2013 [20]	API X70 (inner); API X70 (edge)	2.250; 1.970	3.020; 2.290	2.140; 2.000
Cheng, 2007 [22]	API X65	0.924	1.060	0.864
Turnbull and Carroll, 1990 [23]	AISI 410	0.076	0.042	0.190