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| INVESTIGATION OF CHEMICAL AND ELECTROCHEMICAL CHANGES WITHIN CORROSION CRACKS OF Mn—Cu ALLOY |
| Huang Yongchang and Wang Zicong (Shanghai Jiao Tong University) |
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Abstract Mn-Cu alloy is susceptible to SCC in sea water.A simulated occluded corrosion cell was used to study the chemical and electrochemical changes within corrosion cracks of Mn-Cu alloy in 3.5% NaCl solution.Under nature corrosion condition the potential within corrosion cracks always maintained 30-60mV more negative than the bulk potential.As anodic current (i_a=3.5mA/cm~2)passed through the occluded cell,the pH of solution decreased rapidly from 7to 3.5,and the Cl~=concentration increased 1.6 times.A linear relationship existed between Cl~= migration into occluded cell and time.When the bulk specimen was cathodically polarized at potential -0.85～0.95 V(vs.SCE),the potential within corrosion cracks is approximatelly equal to the bulk potential,and the pH in the occluded cell increased from 7to 8-9.Therefore SCC of Mn-Cu alloy can be prevented by cathodic protection.Control of the bulk potential range (-0.90～-0.95 V,vs.SCE)could prevent the initiation and propagation of cracks,
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Received: 25 February 1989
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