TCR Arabia performs a wide range of Corrosion and Stress Corrosion Tests as part of the ASTM, NACE or client supplied specifications. Senior staff members with specific expertise are available to help and advise on corrosion problems or materials selection in laboratory or on-site inspection. A wide variety of routine tests can be undertaken to determine intergranular corrosion attack, weight loss corrosion, pitting corrosion, Sour gas service corrosion tests for sulfide stress cracking (SSC), CSC, salt spray, and hydrogen-induced cracking (HIC) in oil and gas, power, construction, shipping, petrochemical and process industries.

• Inter granular Corrosion Test (IGC) per ASTM A262 Practice A B C D E & F
• Pitting Corrosion test as per ASTM G48 Specification
• Hydrogen-Induced Cracking Test (HIC)as per NACE TM0284
• Sulfide Stress Corrosion Cracking Test (SSC) as per NACE TM0177
• Salt Spray Test per ASTM B117
• Chloride Stress Corrosion Test as per ASTM G36 Specification
• Corrosion test as per ASTM G35 specification
• Ammonia Vapour Test
• Corrosion test as per ASTM A761 Specification

TCR Arabia performs HIC test to evaluate the resistance of pipeline and pressure vessel plate steels to Hydrogen Inducted Cracking caused by hydrogen absorption from aqueous sulfide corrosion. An unstressed test specimen is exposed to a solution at ambient temperature and pressure and after a specified time, the test specimen is removed and evaluated.

TCR Arabia issues a detailed written report upon completion of each test. Each report includes a description of the test sample that was received, the test procedure that was used, and the pH values of the test solution before exposure and after the exposure. The test bars are cut into sections and examined under a microscope for hydrogen-induced cracks. The dimensions of any such cracks are recorded and used to compute the values in percentage for Crack Length Ratio (CLR), Crack Thickness Ratio (CTR) and Crack Sensitivity Ratio (CSR).

Sulfide stress corrosion cracking (SSC) is a form of hydrogen embrittlement cracking which occurs when a susceptible material is exposed to a corrosive environment containing water and H2S at a critical level of applied or residual tensile stress. TCR Arabia conducts the NACE TM0177 tests including Methods A and B for SSCC test, at our corrosion testing laboratory.

NACE TM0177 specifies Solution A (acidified), Solution B (acidified and buffered) and Solution C (for martensitic stainless steel). Solution A is used in Methods A unless the properties of Solution B or C are specified. In any case, H2S is bubbled through the solution constantly throughout the test period. Testing is performed in NACE solutions A and/or B, saturated with H2S at 24º and 90º Celsius. Stressed samples are exposed to sour environment for a pre-determined time, after which they are removed and analyzed for crack detection. NACE TM0177 specifies test duration of 30 days (720 hours) for Method A or B test.

TCR Arabia issues a written report for each test, or group of tests performed. This report includes a description of the test sample that was received and of the test procedure that was used, the pH values of the test solution before and after the exposure, the results of the hardness test performed on the test specimen and a statement declaring the results of each test. TCR Arabia requires 6 weeks to complete the SSC test.

At TCR Arabia several methods exist for the testing of intergranular corrosion. To conduct these tests, we carefully choose a method which is suitable for the steel grade and grain boundary composition to be tested. Intergranular corrosion in stainless steels may result from precipitation of carbides, nitrides or intermetallic phases. Only in the most highly oxidizing solutions can intergranular attack be caused by intermetallic phases. When a test is to be restricted to carbides, in a material containing nitrides or intermetallic phases, a less oxidizing solution is chosen.