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- W2368146857 abstract "Abstract: Corrosion of magnesium alloys is an important issue for their applications in automobile and aerospace industry. pH values as a function of time in two types of simulated occluded corrosion cells (OCC) for magnesium alloys AZ80 and AM60 were measured. The influence of mass ratio of solution to material or liquid to solid ratio (L/S ratio), initial pH value and chemical compositions of solutions on pH value in OCC was discussed. The experimental results show that pH value for magnesium alloys increases gradually or rapidly in Occ, depending on L/S ratio, initial pH value of solution and chloride ions concentration etc, and then reaches up to 10.5−10.6 and finally stabilizes at the level. The onset in the pH value time curve corresponds to the precipitate of magnesium hydroxide according to the theoretical calculation. Key words: magnesium alloy; pH value; corrosion; occluded corrosion cell; free corrosion potential 1 Introduction A growing interest on magnesium alloys has attracted applications in automotive, aerospace and 3C (computer, communication, consumer electronics) industry as well as bioengineering. Corrosion is an important concern for designers and engineers due to the activity of magnesium. Although the corrosion mechanism of magnesium and its alloys have been discussed in the previous studies, the environment in corrosion pits, however, is sparsely investigated[1−3]. It is demonstrated that most of the attack on magnesium alloys takes place in the form of pitting at the initial stage. The corrosion pit is also an initiation of stress corrosion cracking and corrosion fatigue. Corrosion mechanism of magnesium alloys is quite different from the well-known knowledge dealing with corrosion on steel and aluminium. For instance, it is known that acidification of steel and aluminium occurs in occluded corrosion cells(OCC), pH values of iron and aluminium are 2.70−4.71 and 3.50, respectively[8−10]. SEDRIKS et al[11], however, have reported that pH value of AZ61 in solution after 10 min is stabilized at 11.9. And SONG et al[12] have found that the alkalinization effect caused by corroding magnesium results in an increase in pH value of the SBF to over 9 in about 10 h and finally to a relative stable value of 10.5. And SONG[13] has also observed that a small piece of corroding Mg coupon (1 cm" @default.
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- W2368146857 date "2007-01-01" @default.
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- W2368146857 title "pH value in simulated occluded corrosion cell for magnesium alloys" @default.
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