Hydrogen embrittlement, corrosion and

The heart of corrosion science has been identified as electrochemical science coupled with the thermodynamic and kinetic values. Other limbs are oxidation and high-temperature oxidation of metals, protective coatings, passivity, inhibitors, microbial-induced corrosion, corrosion fatigue, hydrogen embrittlement and corrosion-resistant alloys. Having identified the limbs of corrosion science, it is instructive to examine how the various aspects came into existence over a period of time. 

Cleaning and degreasing of tantalum parts must be done after metalworking and machining in order to remove adherent greases and scales. It presents no special problems, and conventional methods and materials maybe used. However, owing to hydrogen embrittlement and corrosion by alkaline solutions, hot caustics (e.g., NaOH and KOH) must be avoided. 

Gibala R and Hehemann R F (eds) 1984 Hydrogen Embrittlement and Stress Corrosion Craoking (Metals Park, OH American Soceity of Metals)... 

Despite considerable developments in the study of stress-corrosion cracking mechanisms in recent years, it remains difficult to draw a clear distinction between those situations which involve hydrogen embrittlement, and those... 

Duquette, D. J., Fundamentals of corrosion fatigue behaviour of metals and alloys , in Proc. Conf. Hydrogen Embrittlement and Stress Corrosion Cracking, Cleveland, Ohio, 1-3 June 1980, Case Western Reserve University Department of Metallurgy and Materials Science, pp. 249-70 (1980)... 

An explosion rupturing an ammonia separator (still) in an ammonia production unit, probably because mercury vapour from geological sources entered with hydrogen syngas originating from natural gas and reacted to give explosive nitride deposits. The separator remains crackled when scraped [1]. For a more academic study of the effects of mercury on ammonia plants, including embrittlement and corrosion, as well as explosive deposits [2],... 

E. SNAPE obtained his BS and PhD degrees in Metallurgical Engineering from the University of Leeds in 1965. During his research career with Inco, he received numerous awards for his work on stress corrosion and hydrogen embrittlement, and became an international authority on this subject. In 1974, Dr. Snape pioneered the development of a waste reclamation process which now is being applied to the recovery... 

A.R. Troiano Hydrogen Embrittlement and Stress Corrosion Cracking 1984... 

Szklarska-Smialowska, Z., Hydrogen Embrittlement and Stress Corrosion Cracking, R. Gibala, R.E Hehemann (eds.), ASM International, pp. 99 207-230, 1995. 

A/cm. The choice is between higher protection at the risk of local overprotection (and possible hydrogen embrittlement) and less protection at the risk of corrosion, particularly in regions farther from the anodes. It is also a choice between the high cost of electric power on the one hand and the need for more frequent maintenance due to incomplete protection from corrosion, on the other. 

Wei, R. P., Klier, K., Simmons, G. W., and Chou, Y. T., Fracture Mechanics and Surface Chemistry Investigations of Environment-Assisted Crack Growth, in Hydrogen Embrittlement and Stress Corrosion Cracking, Ronald Gibala, et al., eds., American Society for Metals, Metals Park, OH (1984), 103. 

J. Wooddi, R. Kieselbach, Damage due to hydrogen embrittlement and stress corrosion cracking, Eng. Fail. Anal 7 (2000) 427-450. 

In several eases, non-metallie materials such as polymers, rubbers, ceramics, wood or concrete must also be taken into consideration (see Section 10.1.11). With respect to materials selection for screws, bolts, nuts, rivets or oflier small parts for use under possible galvanic corrosion conditions, it should be checked that they are a little more noble (have a little more positive corrosion potential in the actual enviroiunent) than the components they are binding together, or are in metallic contact with in any way. In addition, one should be particularly careful to avoid catastrophic deterioration forms such as hydrogen embrittlement, stress corrosion cracking and corrosion fatigue in such parts. 

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