Basim M. The Iraqi Journal For Mechanical And Material Engineering, Vol. 9,No. 3, 2009

395

(Al–2Cu–2Mg)

(Al-2Cu-2Mg)

(3%NaCl))((3%HCl))(

(600X)

) (500°C)

(170°C) (12%,24%)

(170°C)(

(Al–2Cu–2Mg)

396

The Effect of Heat Treatment and Thermo-Mechanical

Treatment on the Corrosion Behavior of (Al-2Cu-2Mg) Alloy

Basem Mohysen Mohammed Zuheir Talib Khulief Al-Tai

Babylon Un/College of Mat. Eng. Babylon University/College of Eng.

Met. Mat. Eng. Dep. Mat. Eng. Dep.

Abstract:

This study deals with the effect of heat treatment and thermo-mechanical

treatment on the corrosion behavior of (Al-2Cu-2Mg) alloy by using simple immersion

in salt solution ((3% NaCl) by weight) and acidic solution((3% HCl) by volume) at

room temperature. The weight change method and microscopic examination are used in

this study. Alloy without treatment, solution heat treated at (500 C), artificial aged at

(170 C) and thermo-mechanical treated (12%,24%) are used to complete this study.

The result of effects of heat treatment on the corrosion behavior of alloy in salt

solution showed different corrosion behavior for the same alloy under the same

conditions but at different heat treatments. Solution heat-treated alloy has the lowest

loss weight levels compared with the other states untreated and artificial aged alloys

which showed convergence in corrosion rate at the final stages of the test .In other

hand the results of effects of thermo-mechanical treatment on the corrosion behavior

in salt solution showed that the lower cold working percent cause vibration in corrosion

rate while high cold working percent cause in reducing weight and lower corrosion rate

.

The result of effects of heat treatment on the corrosion behavior of alloy in

acidic solution showed that the solution-treated alloy have the lowest weight losing

compared with the untreated and artificial aged alloys where the last one show a mid

state between the other states. In the other hand the results of effects of thermo-

mechanical treatment on the corrosion behavior in acidic solution showed that the

corrosion has been dropped with increase the cold work ratio and the results showed

decreasing in weight loss with increasing the percent of cold working.

2001 (D. A.Little and J. R. Scully)

(SCC) (Al-Cu-Mg-Ag) C416) (

C415(99.99%)

Basim M. The Iraqi Journal For Mechanical And Material Engineering, Vol. 9,No. 3, 2009

397

(NaCl) (0.006

– 0.06 M)(C415) (C416)

(99.99%) (D.A.Little

and J. R. Scully, 2001)2001(Eiji Akiyama , K . Asami)

Ti , Zr , Nb ,Ta ,Cr (1M HCl)

(30°C)

(passive film )(Eiji Akiyama , K . Asami , 2001) 2002 (H .

Bohni and T. Suter)(2024-T3)

(Al-Cu-Fe-Mn)(Al-Cu-Mg)

(H . Bohni and T. Suter ,2002)

2002(N. Le Bozec, D. Persson)

( Filiform Corrosion )

(FTIR Microspectroscopy and Scanning Kelvin Probe)

(filament head)

(filament tail)

(Aluminum Chloride or Aluminum Oxy

Chloride)

( Aluminum hydroxide gel containing

carbonate ) (N. Le Bozec, D. Persson and other,2002) ( 2002 )

(H. N. Mcmurray, G.- Williams and S. O. Driscoll) (Filiform

Corrosion)(AA2024T3)

(Scanning Kelvin Probe)

(0.5 HCl mol dm) (20°C)

( Ecorr. )( -200 )(-400)

(Al–2Cu–2Mg)

398

( Ecorr. )

(H.N.Mcmurray, G.- Williams and S. O. Driscoll, 2002)

( 2002 )

(D.Bengtsson Blucher, J. E. Svensson and L.G. Johansson)

(NaCl)(CO2)

( AA1070 )

( 4,10,22,38,50,60°C)( 95 0.3 % )

( 4 ) ( CO2 )

(

CO2)(D.Bengtsson Blucher, J. E. Svensson and L.G. Johansson,2002)

(Ingrid Rink and D. Martin Knotter)

(0.4%)

( 35,45°C )

(Ingrid Rink and D. Martin Knotter,2003)

Al-

2Cu-2Mg

)(Al-2Cu-2Mg

1

Heater

RT-1000ºC

Basim M. The Iraqi Journal For Mechanical And Material Engineering, Vol. 9,No. 3, 2009

399

-1

-2

-3

300- 400ºC

15mm

(Sola Basic S.B

Lindberg200-1200ºC

500ºC

2

HERGON

500ºC

45min

Al–2Cu–2Mg

170ºC

MLW

Cold work

Al–2Cu–2Mg

(Al–2Cu–2Mg)

400

PHYWE

12,24% 170ºC

Al–2Cu–2Mg

(3wt%NaCl)

(3vol% HCl )

Sartorius

0.0001

Basim M. The Iraqi Journal For Mechanical And Material Engineering, Vol. 9,No. 3, 2009

401

(Union ME-3154)

(600X)

(1)(Al-

2Cu-2Mg)(3wt%NaCl)

(290 hrs)

(3wt%NaCl)(2-b)

(1)

(500° C)(45 min.)

(220 hrs)

(Al2Cu) ,S(Al2Cu Mg) ( L.Reich ,S.P.Ringer

and K.Hono,1999)

(αss)

(220 hrs. )

(S',S")( L.Reich

,S.P.Ringer and K.Hono,1999)

(S)( L.Reich ,S.P.Ringer and K.Hono,1999)

(Ingrid Rink and D. Martin Knotter,2003. R.G.Buchheit,

(Al–2Cu–2Mg)

402

R.K.Boger, M.W.Donohue,2001. R.G.Buchheit, R.K.Boger,2002 )

290 hrs

(2-c)

(NaCl)

(170°C) ( 3 hrs )( 1)

40 hrs

3 hrs170 °C S",S'

(L.Reich ,S.P.Ringer and K.Hono,1999)

S

S",S',Sα

290 hrs2-d

S",S',S

S",S'

170

°C3wt%NaCl

Basim M. The Iraqi Journal For Mechanical And Material Engineering, Vol. 9,No. 3, 2009

403

12%

3wt%NaCl24%

170°C3 hrs

4

(3vol% HCl)

S , θα

HCl (Ingrid Rink and D. Martin Knotter,2003.

R.G.Buchheit, R.K.Boger, M.W.Donohue,2001)

500°C45min.

αss

(Al–2Cu–2Mg)

404

170°C (3vol% HCl)

S" , S'3hrs.

S",S'

S(Al2CuMg)

500°C

170°C ( 3vol% HCl ) 5.5 hrs.

(5-a)(5-c) (5-b)(5-a)

(5-b)

(5-c)

170°C 3 hrs

(3vol% HCl)6

Basim M. The Iraqi Journal For Mechanical And Material Engineering, Vol. 9,No. 3, 2009

405

-D.A.Little and J. R. Scully, “An Electro Chemical Framework to Explain the Inter-

granular Stress Corrosion Path of two Al–Cu–Mg–Ag Alloys , C415 and C416” , PDF,

2001 .

On the web: http://cat.inist.fr/?aModele=afficheN&cpsidt=18489225

-Eiji Akiyama, K. Asami and other, “Enhancement of Corrosion Resistance of

Amorphous Aluminum alloys by Alloying Additions”, pdf, 2001.

On the web: www.nims.go.jp/pmg/html/akiyama%20Publication%20Record.htm

-H. Bohni and T. Suter “Localized Corrosion Studies on a Molecular Level”, PDF,

2002.

-N. Le Bozec, D. Persson and other, “Analysis of Filiform Corrosion on Coated

Aluminum Alloy by FTIR Micro-spectroscopy and Scanning Kelvin Probe”, PDF,

2002.

On the web: link.aip/link/?JES/149/B403/1

-H.N .Mcmurray, G. Williams and S. O. Driscoll ,”Chromate Inhibition of Filiform

Corrosion on Organic Coated AA2024T3 Aluminum Alloy Investigated using a

Scanning Kelvin Probe” , PDF .2002 .

On the web: link.aip.org/link/?ESLF616/B9/1

-D.Bengtsson Blucher, J.E.Svensson and L. G. Johansson, “The NaCl – Induced

Atmospheric Corrosion of Aluminum; the Influence of Carbon Dioxide and

Temperature”, PDF ,2002 .

(Al–2Cu–2Mg)

406

On the web: direct .bl.uk/research/42/15/RN/28088222.html.

-Ingrid Rink and D. Martin Knotter, “ Passivation of Aluminum and Aluminum –

Copper Alloys in Aqueous Acids”, PDF, 2003.

On the web: www.electrochem.org/dl/ma/204/pdfs/0817.PDF

- L.Reich ,S.P.Ringer and K.Hono ,”Origin of of the initial rapid age-hardening in an

Al-1.7Mg-1.1Cu alloy”. Philosophcal Magazine Letters,79(9):6840.1999.

-R.G.Buchheit, R.K.Boger, M.W.Donohue, “Copper Dissolution Phenomena in Al-Cu

and Al-Cu-Mg Alloys”,2001.

On the web : http//www.mse.ohio-stst.edu/%7Ebruedigm/RGB02.pdf

-R.G.Buchheit, R.K.Boger, “Cu Redistribution and Surface Enrichment Due to

Dissolution of Al-Cu Alloys”, 2002.

On the web: http//www.mse.ohio-stst.edu/%7Ebruedigm/RGB03.pdf

( 1 )

Al

Mg Cu

at%wt%at%wt%

remainder 2.252 0.86 2 Al –2Cu – 2Mg

2

D(mm) t(mm) d(mm)

untreated 15 32

3% HCl

3% NaCl

S.H.T at 500 C+A.A at 170C 1532

3% HCl

3% NaCl

S.H.T at 500 C+

C.W=12%+A.A at

170C

16.12.623% HCl

3% NaCl

S.H.T at 500 C+ 17.12.323% HCl

Basim M. The Iraqi Journal For Mechanical And Material Engineering, Vol. 9,No. 3, 2009

407

C.W=24%+A.A at

170C3% NaCl

2-a

(600 X)

1

3wt%NaCl

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300

time (hrs.)

-2.0E-6

0.0E+0

2.0E-6

4.0E-6

6.0E-6

8.0E-6

1.0E-5

1.2E-5

1.4E-5

1.6E-5

1.8E-5

Weig

ht

loss

/un

it a

rea

(g

/mm

)

water+3% NaCl

Untreated

Solution Heat Treated at (500 C)

Artificial Aged at (170)

(Al–2Cu–2Mg)

408

2-c

500°C(3wt% NaCl)(600X)

2-d170

°C(3wt% NaCl)( 600X )

2-b

(3wt% NaCl)(600 X)

Basim M. The Iraqi Journal For Mechanical And Material Engineering, Vol. 9,No. 3, 2009

409

4

3vol%HCl

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

time (hrs.)

0.0E+0

4.0E-6

8.0E-6

1.2E-5

1.6E-5

2.0E-5

2.4E-5

2.8E-5

3.2E-5

3.6E-5

Weig

ht

loss

/un

it a

rea

(g

/mm

)

Water+3% HCl

Untreated

Solution Heat Treated at (500 C)

Artificial Aged at (170 C)

3wt% NaCl170 °C

0 40 80 120 160 200 240 280 320 360 400 440 480

time (hrs.)

-2E-6

0E+0

2E-6

4E-6

6E-6

8E-6

1E-5

1E-5

Wei

gh

t lo

ss /

un

it a

rea

(g/m

m

)

water+ 3% NaCl

C.W 0 %+A.A at 170 C

C.W 12%+A.A at 170 C

C.W 24%+A.A at 170 C

(Al–2Cu–2Mg)

410

5-c

170°C(3vol% HCl)(600 X)

5-b

500 °C(3vol% HCl)(600X )

5-a

(3vol% HCl)(600X )

Basim M. The Iraqi Journal For Mechanical And Material Engineering, Vol. 9,No. 3, 2009

411

6

3vol%HCl170 °C

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

time (hrs.)

0.0E+0

5.0E-6

1.0E-5

1.5E-5

2.0E-5

2.5E-5

3.0E-5

3.5E-5

4.0E-5

Wei

gh

t lo

ss/u

nit

are

a (

g/m

m

)

Water+3% HCl

CW 0 % +A.A. at 170 C

CW 12% +A.A. at 170 C

CW 24% +A.A. at 170 C