Stainless Steel Critical Gap Corrosion Detection
Suitable for various stainless steel materials such as austenitic stainless steel, ferritic stainless steel, duplex stainless steel, super duplex stainless steel, martensitic stainless steel, precipitation hardening stainless steel, etc.
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Product Introduction
Detection range
Applicable materials: Suitable for various stainless steel materials such as austenitic stainless steel, ferritic stainless steel, duplex stainless steel, super duplex stainless steel, martensitic stainless steel, precipitation hardening stainless steel, etc.
Applicable objects: including stainless steel plates, bars, pipes, profiles, forgings, welded joints, flanges, fasteners, gasket overlaps, heat exchangers, chemical equipment, marine engineering components, and stainless steel parts with gap structures.
Applicable scenarios: Suitable for determining the critical crevice corrosion temperature of stainless steel in environments such as chloride solutions, seawater, saltwater, and industrial corrosive media. It can be used for evaluating the crevice corrosion resistance of solid solution, welded, and heat-treated stainless steel.
Testing purpose: Used for stainless steel material selection, corrosion resistance grading, welding/heat treatment process verification, product quality acceptance, service safety evaluation, and gap corrosion failure analysis.
Testing items
Determination of critical crevice corrosion temperature (CCT): Heat up step by step in a standard ferric chloride test medium to determine the lowest temperature at which stainless steel undergoes crevice corrosion.
Crack corrosion morphology detection: Observe the corrosion morphology, corrosion area, and corrosion depth in the crack area to determine the corrosion characteristics and severity.
Special testing of welded joints: Determine the critical crevice corrosion temperature of stainless steel welds and heat affected zones, and evaluate the influence of welding processes on crevice corrosion resistance.
Sensitivity assessment of crevice corrosion: Based on the critical crevice corrosion temperature value, classify and compare the crevice corrosion resistance of stainless steel.
Qualification assessment of test results: Determine whether the critical crevice corrosion temperature of stainless steel meets the usage requirements according to the standard requirements.
Testing Standards
GB/T 32550-2016 Corrosion of metals and alloys Determination of critical pitting and critical crevice corrosion temperatures for stainless steel and nickel based alloys
GB/T 18590-2019 Corrosion pitting and crevice corrosion assessment methods for metals and alloys
ASTM G48-25 Standard Test Method for pitting and crevice corrosion resistance of stainless steel and related alloys using ferric chloride solution
ISO 19280:2017 Corrosion of metals and alloys - Measurement of geometric critical gap temperature in cylindrical gaps in ferric chloride solution
was established in 2011. As a national high-tech enterprise recognized by the Zhejiang Provincial Higher People's Court as a judicial authentication institution for construction engineering quality, we specialize in structural performance testing and safety assessment of construction projects, special equipment, communication towers, electromagnetic environments, large bridges, and building safety appraisal.
The company has more than 100 professional and technical personnel, over 90% of whom hold various medium and senior technical certificates. Equipped with complete testing equipment worth over RMB 10 million, our business scope covers the whole country.
