Excellent corrosion resistance of titanium alloy

◎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