Senior staff members with specific industry expertise cover a variety of corrosion problems that are encountered in industries such as oil and gas production, oil and gas transmission, energy conversion systems, and nuclear power systems. A wide variety of corrosion related tests can be undertaken at TCR Engineering Services in India to determine weight loss corrosion, intergranular corrosion
attack, pitting corrosion
, corrosion fatigue, stress corrosion cracking, sulfide stress corrosion cracking
, and hydrogen-induced corrosion
cracking. We can also carryout the tests listed below under 3rd party inspection of LRS, TUV, DNV, ABS and other inspection agencies at our laboratory in Mumbai, India.
Salt Spray (Neutral / Fog), ASTM B117
This is the most commonly used salt spray for testing of inorganic and organic coatings, especially where such tests are used for material or product specifications. Salt Spray testing is a tool for evaluation the uniformity of thickness and degree of porosity of metallic and nonmetallic protective coatings. A number of samples can be tested at once depending upon their size.
Pitting Corrosion Test, ASTM G48 Method B Specification
This Procedure is used to assist in the selection of test methods that can be used in the identification and examination of pits and in the evaluation of pitting corrosion to determine the extent of its effect. ASTM G48 Method B, Ferric Chloride Test involves exposing a specimen to a highly oxidizing acid chloride environment. The importance of this evaluation is to be able to determine the extent of pitting, either in a service application where it is necessary to predict the remaining life in a metal structure, or in laboratory test programs that are used to select the most pitting-resistant materials for service.
Corrosion test as per ASTM G 35 specification
The polythionic acid (sulfurous acid and hydrogen sulfide) environment provides a way of evaluating the resistance of stainless steels and related alloys to inter granular stress corrosion cracking. This practice can be applied to wrought products, castings, weld metal of stainless steels or other materials to be used in environments containing sulfur or sulfides.
Hydrogen-Induced Cracking (HIC) Test, NACE TM0284
TCR Engineering Services, corrosion testing laboratory in Mumbai (India) 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.
To conduct the HIC test, TCR Engineering Services requires the following sample sizes:
Plate - 150mm x150mm with rolling direction marked on it
If the plate is more than 80mm think - 250mm x 250 mm sample size is required
Pipe - upto 2" OD - 200mm long
If the pipe is more than 2" OD pipe - 100mm long sample size is required
Bars - Upto 3" dia - 300mm long
If the Bars are more than 3" dia to 5" dia - 200mm long sample size is required
If the Bars are more than 5" dia - 100mm long sample size is required
Number of pieces to be tested upto 88mm thick/dia - set of 3 pieces to be tested
Number of pieces to be tested more than 88mm thick/dia - 5 pieces to be tested
TCR Engineering Services can perform sample machining upon request.
NACE TM0284 Test Solution
NACE TM0284 specifies either Solution A or Solution B. Solution A is acidified brine. Solution B is simulated seawater prepared in accordance with ASTM D1141.52. In either case, H2S is bubbled through the solution constantly throughout the test period. NACE TM0284 specifies test duration of 96 hours.
TCR Engineering 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), NACE TM 0177
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 Engineering Services in Mumbai, India conducts the NACE TM0177 tests including Methods A and B for SSCC test, at our corrosion testing laboratory.
NACE TM0177 Test Details
NACE TM0177 tests at TCR includes the following methods:
Method A: Tensile Test (Proof Rings)
Method B: Bent Beam Test (3 or 4 Point Bends)
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.
The SSCC tests at TCR Engineering in India are performed routinely for customers using tensile and bent beam specimens. For each stress level and temperature, the following sample sze is required:
Plate - 16mm Thickness x 160mm long
Pipe - 160 long pieces irrespective of dia, cut strip of 16mm width
Bar - 160mm long piece irrespective of dia
TCR Engineering 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 Engineering requires 6 weeks to complete the SSC test.