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Titanium Corrosion

Author : admin Date : 4/28/2015 8:56:30 PM

Media

Concentration (mass fraction) (%)

Temperature / ℃

Corrosion rate / mm / a (years)

Corrosion Level

Inorganic acid

Hydrochloric acid

1

RT / Boiling

0.000 / 0.345

Excellent / Good

5

RT / Boiling

0.000 / 6.530

Good / poor

10

RT / Boiling

0.175 / 40.87

Good / Bad

20

RT / -

1.340 / -

Poor / -

35

RT / -

6.660 / -

Poor / -

Sulfuric acid

5

RT / Boiling

0.000 / 13.01

Good / poor

10

RT / -

0.230 / -

Good / -

60

RT / -

0.277 / -

Good / Bad

80

RT / -

32.660 / -

Poor / -

95

RT / -

1.400 / -

Poor / -

Nitrate

37

RT / Boiling

0.000 / <0.127

Good / excellent

64

RT / Boiling

0.000 / <0.127

Good / excellent

95

RT / -

0.0025 / -

Excellent / -

Phosphate

10

RT / Boiling

0.000 / 6.400

Good / poor

30

RT / Boiling

0.000 / 17.600

Good / poor

50

RT / -

0.097 / -

Excellent / -

Chromic acid

20

RT / Boiling

<0.127 / <0.127

Good / excellent

Hydrochloric acid, nitric acid +

1: 3

RT / Boiling

0.0040 / 0.127

Good / excellent

3: 1

RT / -

<0.127 / -

Excellent / -

Nitric acid + sulfuric acid

7: 3

RT / -

<0.127 / -

Excellent / -

4: 6

RT / -

<0.127 / -

Excellent / -

Organic acids

Acetic acid

100

RT / Boiling

0.000 / 0.000

Good / excellent

Formic acid

50

RT / -

0.000 / -

Excellent / -

Oxalic acid

5

RT / Boiling

0.127 / 29.390

Good / Bad

10

RT / -

0.008 / -

Excellent / -

Lactate

10

RT / Boiling

0.000 / 0.033

Good / excellent

25

- / Boiling

- / 0.028

- / Excellent

Formic acid

10

- / Boiling

- / 1.270

- / Good

25

- / 100

- / 2.440

- / Differential

50

- / 100

- / 7.620

- / Differential

Dan citric acid

25

RT / Boiling

<0.127 / <0.127

Good / excellent

Citric acid

50

RT / Boiling

<0.127 / <0.127

Good / excellent

Stearate

100

RT / Boiling

<0.127 / <0.127

Good / excellent

Alkaline solution

Sodium hydroxide

10

- / Boiling

- / 0.020

- / Excellent

20

RT / Boiling

<0.127 / <0.127

Good / excellent

50

RT / Boiling

<0.0025 / 0.0508

Good / excellent

73

- / Boiling

- / 0.127

- / Good

Potassium hydroxide

10

- / Boiling

- / <0.127

- / Excellent

25

- / Boiling

- / 0.305

- / Good

50

30 / boiling

0.000 / 2.743

Good / poor

Ammonium hydroxide

28

RT / -

0.0025 / -

Excellent / -

Sodium

20

RT / Boiling

<0.127 / <0.127

Good / excellent

Ammonia

20

RT / -

0.0708 / -

Excellent / -

Inorganic salt solution

Ferric chloride

40

RT / 95

0.000 / 0.002

Good / excellent

Ferrous chloride

30

RT / Boiling

0.000 / <0.127

Good / excellent

Lead chloride

10

<0.127 / <0.127

CuCl

50

<0.127 / <0.127

Ammonium chloride

10

<0.127 / <0.000

Calcium chloride

10

<0.127 / <0.000

Aluminum chloride

25

<0.127 / <0.127

Magnesium chloride

10

<0.127 / <0.127

Nickel chloride

5-10

<0.127 / <0.127

Barium chloride

20

<0.127 / <0.127

Copper sulfate

20

<0.127 / <0.127

Ammonium sulfate

20 ℃ saturated

<0.127 / <0.127

Sodium

50

<0.127 / <0.127

Lead sulfate

20 ℃ saturated

<0.127 / <0.127

Copper sulfate

10

<0.127 / <0.127

30

<0.127 / <0.127

Silver nitrate

11

RT / -

<0.127 / -

Excellent / -

Organic compound

Benzene (contained traces of HCl, NaCl)

Vapor and liquid

80

0.005

Fine

CTC

Ditto

Boiling

0.005

Tetrachlorethylene (stable)

100% of the vapor and liquid

0.0005

Tetrachlorethylene (H2O)

0.0005

Chloroform

0.003

Chloroform (H2O)

 

0.127

Good

Trichloroethylene

99% of the vapor and liquid

0.00254

Fine

Trichloroethylene (stable)

99

0.00254

Formaldehyde

37

0.127

Good

Formaldehyde (containing 2.5% H2SO4)

50

0.305

Good

Notes:
1. Corrosion class is divided into three levels:   Excellent - corrosion, corrosion rate 0.127mm / a or less.   Good - moderate corrosion, corrosion rate in 0.127-1.27mm / a between.   Difference - no corrosion, corrosion rate 1.27mm / a or more. 

2. Titanium in most media, especially those with high corrosion resistance in neutral, oxidizing medium and seawater. Titanium in seawater corrosion resistance than aluminum, stainless steel and nickel alloys is also high in the air industry, agriculture and marine environment, although for several years, the surface does not change color.Hydrofluoric acid, sulfuric acid, hydrochloric acid, phosphoric acid and some hot concentrated organic acids on the corrosion of titanium is large (see table above), regardless of where the hydrofluoric acid concentration, temperature and level of titanium have high corrosion. Titanium stability of various concentrations of nitric acid and chromic acid is high in alkaline solution and most organic acids, inorganic salt solution corrosion resistance is also high. 

3. Titanium does not occur between the localized corrosion and intergranular corrosion, corrosion is even carried out. 

4. Corrosion resistance of commercially pure titanium is similar, it is widely used titanium alloy can be obtained in the chemical and shipbuilding industries reason.