Electrochemical Monitoring of Selective Phase Corrosion of Nickel Aluminum Bronze in Seawater

Lenard, D. R.; Bayley, Christopher; Noren, B.A.

doi:10.5006/1.3278444

Cited by 19 publications

(8 citation statements)

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“…Moreover, the retained β phase can be produced when cooled at a high cooling rate, which has a harmful effect on the corrosion properties due to its direct contact with the cathodic sites and its martensitic structure [16]. Lenard et al [17] also reported that the NAB composed of more β′ phase could produce pit corrosion after long-time exposure to sea water. In the previous literature, β′ phase can be restrained by means of heat treatment [18].…”

Section: Introductionmentioning

confidence: 96%

Effect of Post Heat Treatment on the Microstructure and Microhardness of Friction Stir Processed NiAl Bronze (NAB) Alloy

Wang

et al. 2015

Metals

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NiAl bronze (NAB) alloy is prepared by using friction stir processing (FSP) technique at a tool rotation rate of 1200 rpm and a traverse speed of 150 mm/min. A post heat treatment is performed at the temperature of 675 °C. The effect of heat treatment on the microstructure and microhardness is studied. The results show that the microstructure of the FSP NAB alloy consists of high density dislocations, retained β phase (β′ phase) and recrystallized grains. When annealed at 675 °C, discontinuous static recrystallization (DSRX) takes place. The content of β′ phase gradually decreases and fine κ phase is precipitated. After annealing for 2 h, both the microhardness of the FSP sample in the stir zone (SZ) and the difference in hardness between the SZ and base metal decrease due to the reduction of the dislocation density and β′ phase, accompanying recrystallized grain coarsening. With further increasing of the annealing time to 4 h, the aforementioned difference in hardness nearly disappears.

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Section: Introductionmentioning

confidence: 96%

Effect of Post Heat Treatment on the Microstructure and Microhardness of Friction Stir Processed NiAl Bronze (NAB) Alloy

Wang

et al. 2015

Metals

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“…This result is in agreement with Lenard's study. 33) It shows that the corrosion rate of the NAB composed of more retained ¢ increase steadily for few days compared with one containing less retained ¢ phase until a black film developed on the sample surface. However, the FSP1200/100 sample with a microstructure of lamellar ¡ and retained ¢ phases has a worst corrosion resistance.…”

Section: Salt Fogging Corrosion Results Analysismentioning

confidence: 93%

Investigation of the Microstructure and Corrosion Properties of Friction Stir Processed Cast NiAl Bronze

Wang

et al. 2015

Mater. Trans.

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NiAl bronze (NAB) was produced using the friction stir processing (FSP) technique at various tool rotation rates (½) and traverse speeds (¹). Optical microstructure (OM) observation results indicated that inhomogeneous microstructures were produced from top to bottom in the stir zone (SZ), cavity defects were found in the retreating side (RS) area due to inadequate fill of NAB material flow during FSP. Results indicate that FSP processing parameters have a significant influence on the microstructure of NAB alloy. An optimized FSP processing map was obtained from the analysis of the pseudo heat index ½ 2 /¹. Five optimum processing parameters were selected from the processing map, which were used to investigate the effect of FSP parameters on the corrosion properties of NAB by the salt fogging corrosion test. It was determined that the corrosion properties were improved by decreasing the rotation rate at a constant traverse speed, and the grain size and the volume fraction of retained ¢ phases were reduced by using the optimum FSP parameters. These results could optimize the microstructure and deepen the understanding of the corrosion behavior of FSP NAB.

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“…Several researchers have reported on attempts to develop methods of in situ nondestructive inspection for dealloying, but they have not achieved widespread acceptance [20,22].…”

Section: E Inspectionmentioning

confidence: 99%

Dealloying

Heidersbach¹

2011

Uhlig's Corrosion Handbook

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Electrochemical Monitoring of Selective Phase Corrosion of Nickel Aluminum Bronze in Seawater

Cited by 19 publications

References 0 publications

Effect of Post Heat Treatment on the Microstructure and Microhardness of Friction Stir Processed NiAl Bronze (NAB) Alloy

Effect of Post Heat Treatment on the Microstructure and Microhardness of Friction Stir Processed NiAl Bronze (NAB) Alloy

Investigation of the Microstructure and Corrosion Properties of Friction Stir Processed Cast NiAl Bronze

Dealloying

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