Chemical Milling of Cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo Alloys in Hydrofluoric-Nitric Acid Solutions

被引：23

作者：

Sefer, Birhan ^{[1
,2
]}

Dobryden, Illia ^{[1
,3
]}

Almqvist, Nils ^{[1
]}

Pederson, Robert ^{[1
,4
]}

Antti, Marta-Lena ^{[1
]}

机构：

[1] Lulea Univ Technol, Div Mat Sci, SE-97187 Lulea, Sweden

[2] Univ Politecn Cataluna, Dept Mat Sci & Met Engn, Av Diagonal 647, ES-08028 Barcelona, Spain

[3] KTH Royal Inst Technol, Div Surface & Corros Sci, SE-10044 Stockholm, Sweden

[4] GKN Aerosp Engine Syst, Res & Technol Ctr, SE-46181 Trollhattan, Sweden

来源：

CORROSION | 2017年 / 73卷 / 04期

关键词：

atomic force microscopy; chemical milling/pickling; galvanic corrosion; linear polarization resistance; scanning Kelvin probe force microscopy; titanium alloys; SCANNING KELVIN PROBE; CYCLE FATIGUE PROPERTIES; ALPHA-CASE FORMATION; FORCE MICROSCOPY; CORROSION BEHAVIOR; TITANIUM; PASSIVITY; FRACTURE; LAYER; ZR;

D O I：

10.5006/2277

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The behavior of cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo during chemical milling in hydrofluoric-nitric (HF-HNO3) acid solutions with 1: 3 and 1: 11 molar ratios was investigated using electrochemical and atomic force microscopy (AFM) techniques. Faster corrosion rate in 1: 3 solutions was measured for Ti-6Al-4V than for Ti-6Al-2Sn-4Zr-2Mo, whereas in 1: 11 solution Ti-6Al-2Sn-4Zr-2Mo exhibited higher corrosion rate. Scanning Kelvin probe force microscopy measurements revealed difference in the Volta potential between the alpha-laths and the beta-layers in the Widmansttaten microstructure indicating operation of microgalvanic cells between the microconstituents when in contact with HF-HNO3 solution. The AFM topography measurements demonstrated faster corrosion of the alpha-laths compared to the beta-layers, in both alloys. In 1: 3 solutions, higher alpha/beta height difference was measured in Ti-6Al-4V, whereas in 1: 11 solution, the difference was higher in Ti-6Al-2Sn-4Zr-2Mo. The results revealed that the chemical milling behavior of the two investigated alloys is controlled by the microscopic corrosion behavior of the individual microconstituents.

引用

页码：394 / 407

页数：14

共 41 条

[1]

[Anonymous], 1999, STAND PRACT CALC COR

[2] Corrosion Behavior of Ti-6Al-4V with Different Thermomechanical Treatments and Microstructures [J].

Atapour, M. ;

Pilchak, A. ;

Frankel, G. S. ;

Williams, J. C. ;

Fathi, M. H. ;

Shamanian, M. .

CORROSION, 2010, 66 (06)

[3]

Bäck G, 2005, CORROSION-US, V61, P951, DOI 10.5006/1.3280895

[4]

Beck T.R., 1974, Localized corrosion, P644

[5] An overview on the use of titanium in the aerospace industry [J].

Boyer, RR .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1996, 213 (1-2) :103-114

[6] Modeling of alpha-case formation and its effects on the mechanical properties of titanium alloy castings [J].

Chan, Kwai S. ;

Koike, Marie ;

Johnson, Benjamin W. ;

Okabe, Toru .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2008, 39A (01) :171-180

[7] In situ corrosion monitoring of Ti-6Al-4V alloy in H2SO4/HCl mixed solution using electrochemical AFM [J].

Chen, Jhen-Rong ;

Tsai, Wen-Ta .

ELECTROCHIMICA ACTA, 2011, 56 (04) :1746-1751

[8]

Chen Y. L., 1990, US Patent, Patent No. [4,900, 398, 4900398]

[9]

DAS KB, 1974, CORROSION, V30, P324, DOI 10.5006/0010-9312-30.9.324

[10] HIGH-TEMPERATURE TITANIUM-ALLOYS - A REVIEW [J].

EYLON, D ;

FUJISHIRO, S ;

POSTANS, PJ ;

FROES, FH .

JOURNAL OF METALS, 1984, 36 (11) :55-62

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