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Excellent corrosion resistance of titanium alloy

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◎Nine excellent corrosion resistance
(1)Resistance to (sulfide) stress corrosion cracking
(2)Resistance to hydrocracking
(3)pitting corrosion resistance
(4)Crack corrosion resistance
(5)Corrosion resistance of H2S and CO2 under high temperature and high pressure
(6)Resistance to seawater/salt spray corrosion
(7)abrasion-resistance
(8)Resistance to organic acids and bases
(9)Corrosion-resistant gas
 
◎Evaluation test of stress corrosion cracking resistance-----Excellent SSC resistance
(1)Stress Corrosion cracking (SSC) test in solution A with A method

 


 

(2)Stress corrosion cracking (SSC) test under Operating stress
 

 

The loading stress is 100% ysmin (758 MPa

Total pressure/MPa

12

Temperature/℃

160

H2S partial pressure/MPa

≦1.2 MPa

CO2 partial pressure/MPa

6MPa

Test time/h

720

Ion content/mg·L-1

CO32-/0, HCO3-/189, OH-/0, Cl-/128000,SO42-/430, Ca2+/8310, Mg2+/561, K+/6620, Na+/76500

pH

2.5

 

 

◎Resistance to hydrocracking(HIC)

 

 

Titanium alloy tubing material has passed NACE TM 0284-2000 standard:
Crack sensitivity (CSR):0
Crack length rate (CLR):0
Crack thickness ratio (CTR):0
Titanium alloy is not sensitive to HIC

 

◎Evaluation of resistance to point corrosion

 



 

◎Evaluation test of high temperature and high pressure containing H2S / CO2 under simulated working condition

Working condition
Temperature 160 °C, partial pressure of H2S 2.66 MPA, partial pressure of CO24.5 MPA, cl-: 120000PPM, flow velocity 3M / S
At 155 °C, H22S partial pressure 4MPA, CO2 partial pressure 4.5 MPA, cl-: 120000ppm, Flow Velocity 3M / S
Temperature 60 °C, partial pressure of H2S 2.0 MPA, partial pressure of CO23.5 MPA, cl-: 120000PPM, flow velocity 3M / S

 

Items

Average weight before test(g

Average weight after test(g

Mass loss(g

Sample area(mm2)

Corrosion rate(mm/a

Working condition 

1#

4.8751

4.8748

0.0003

1075.38

0.0008

2#

4.8448

4.8448

0.0000

1068.03

0

3#

5.2134

5.2130

0.0003

1082.73

0.0007

 

Uniform corrosion rate is less than 0.001mm/a

 

 

◎Evaluation of seawater /salt spray corrosion resistance

 



 

◎Excellent erosion resistance

 



 

 

 

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