... (t-out = 24 hours) in air sufficient for hydrogen level to fall to a constant level (C_MIN). Experimental procedure for slow strain rate tests Abstract In this study the hydrogen diffusion and trapping characteristics of four API line pipe grade steels were investigated...

...Most of the material properties can be found in the literature, ^{4 - 5} except the material yield strength which in this study was 758 MPa (110 ksi) and the hydrogen diffusivity was 2.0x10^-6 cm²/s. SMALL PIPE AND SENT TEST IN SOUR ENVIORNMENT In an American...

... on the exit side, having severe influence on the hydrogen diffusion. ¹⁸ The experimental procedure was as follows: the cleaned sample was placed between the two cells and the open circuit potential as well as the background oxidation current of the sample were measured. After the background...

... observations were made for the hydrogen diffusion coefficients, determined by means of Devanathan and Stachurski technique. The hydrogen diffusion coefficients of δ phase rich variants were about twice as high as of the variations with γ’ and γ” phases. The obtained experimental results provide an important...

... sulphide as in gas treatment industry) or using cathodic charging. This paper proposes to explain the differences between the two previously cited grades when facing gaseous and aqueous hydrogen and then the consequences on fracture performance. This demonstration is based on actual hydrogen diffusion...

... decreased hydrogen diffusivity and increased hydrogen concentration in the steel. Results were compared with our previous results concerning the effect of different steel microstructures on diffusivity of hydrogen on the same steel. (2) M H a d s + H 2 O + e − → H 2 + O H...

...Abstract Low alloy steels such as X65 are common choices for offshore flowlines and risers in sour service applications. These alloys become susceptible to corrosion fatigue because of large thermal transients and wave motion that lead to fatigue loading. Hydrogen diffusion to the regions...

... the knowledge of the hydrogen diffusion, a test program was set up to measure the hydrogen diffusion coefficient in the materials tested in the aforementioned research using the Devanathan and Stachurski electrochemical method ¹⁵ . This method is considered simple and effective and it has been...

.... This contribution reports both mechanical and metallurgical assessments performed on these heavy plates. Evaluation of hydrogen resistance (HTHA) as well as creep resistance under high hydrogen pressure is also reported. Hydro-treatment 9Cr1MoV Hydrogen Diffusion Hydrogen Solubility Trapping Effect Hydrogen...

.... This paper proposes to explain the differences between the two previously cited grades when facing gaseous hydrogen and then the consequences on HID performance. This demonstration is based both on actual hydrogen diffusion and solubility laws measurements, hydrogen content profile simulations and actual HID...

... diluted Sulfur Methane formation grain boundaries Hydrogen diffusion electrochemical galvanic reactions enamel lining Introduction In a chemical plant, carbon steel and stainless steel material of pressure vessels and containers are widely used. Some of the vessels and containers are damaged during...

...Hydrogen, diffusing through the metal lattice is known to accumulate at voids and other defects and recombine to form molecular hydrogen ⁸ . When a critical internal pressure of molecular hydrogen is reached, cracking is initiated at the voids. According to this theory, the danger...

..., was assessed with the transient model. Sour environment sulfide stress cracking double cantilever beam hydrogen diffusion INTRODUCTION Hydrogen embrittlement (HE) is a critical issue in well products destined to work in sour conditions. The occurrence of Sulfide Stress Cracking (SSC) in OCTG products may...

... (Pd) in order to ensure the reliability of the hydrogen oxidation current. ¹⁰ If it had not been electroplated on the oxidation side, there would have been the oxide layer leading to an error in hydrogen permeation current. Abstract The effect of microstructure on hydrogen diffusion...

... of tested steel was measured and threshold stress for SSC was taken as a resistance parameter. After testing, fracture morphology was analyzed with SEM and energy disperse spectroscopy (EDS). Hydrogen diffusion Abstract The purpose of this study is to elucidate the effect of Cr and Mo on sulfide stress...

... of the matrix surrounding the site where initiation occurs. The SSC and HIC susceptibility of steels containing Cr, Ni, and Mo under stress and hydrogen diffusion was investigated by cathodic polarization. As the content of alloying elements increased, the apparent hydrogen diffusion coefficient (D...

... the potential for hydrogen damage (HIC) and to provide a detailed evaluation of the corrosion processes occurring within a process vessel. hydrogen diffusion hydrogen monitors hydrogen flux HIC threshold hydrogen concentration INTRODUCTION When corrosion processes involving hydrogen evolution occur, some...