Corrosion and optimum corrosion protection potential of friction stir welded 5083-O Al alloy for leisure ship

Electrochemical tests were undertaken to determine the optimum conditions in seawater for corrosion protection of friction stir-welded 5083-O Al alloy. Polarization trend observations show that the limiting potential that avoids the effects of hydrogen embrittlement is -1.6 V, corresponding to the c...

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Veröffentlicht in:Transactions of Nonferrous Metals Society of China 2009-08, Vol.19 (4), p.898-903
Hauptverfasser: PARK, Sung-Hyeon, KIM, Jong-Shin, HAN, Min-Su, KIM, Seong-Jong
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Sprache:eng
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Zusammenfassung:Electrochemical tests were undertaken to determine the optimum conditions in seawater for corrosion protection of friction stir-welded 5083-O Al alloy. Polarization trend observations show that the limiting potential that avoids the effects of hydrogen embrittlement is -1.6 V, corresponding to the crossover point between concentration polarization and activation polarization. However, the optimum protection potential is between -1.5 and -0.7 V since the current density at these values is low in the potentiostatic tests. When a galvanic cell is formed in the seawater, the welds exhibit electrochemically stable trends. Welded parts in galvanic tests with various area ratios are stable and have excellent anticorrosion characteristics.
ISSN:1003-6326
DOI:10.1016/S1003-6326(08)60373-8