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Abstract An investigation was carried out in situ on the crevice corrosion of titanium in hot acid NaCl solution by means of microelectrode technique, etc.The crevice corrosion rate of titanium increased with increasing temperature,concentration of Cl~-,H~+ and decreasing crevice gap. However,with increasing concentration of dissolved oxygen,the incubation period of crevice corrosion of Ti was prolonged.When the crevice corrosion of Ti occurred,the pH of solution within the crevice lowered down to about 0.9 and the potential of the metal in the crevice was below -650 mV(vs.0.1N KCl Ag/AgCl),meanwhile the current density of the crevice corrosion and activity of chloride ion within crevice increased enormously.The“self-catalysis mechanism”of crevice corrosion of titanium in hot acid NaCl solution is proposed according to the experimental results.
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Received: 25 June 1990
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