MaTestLab > Test Standards > ASTM G46 Standard Guide for Examination and Evaluation of Pitting Corrosion
Last updated 6th March 2025
ASTM G46 Standard Guide for Examination and Evaluation of Pitting Corrosion
ASTM G46 is employed to assess pitting levels in service applications where predicting the remaining life of a metal structure is necessary. It serves various purposes, including evaluating alloy performance, determining alloy resistance to the environment, and analyzing the effects of environmental variables like corrosion inhibitors on pitting. ASTM G46 assesses pitting levels in service applications crucial for predicting the remaining life of metal structures.
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ASTM G46 Introduction
The ASTM G46 guide provides procedures for identifying and examining pits and evaluating pitting corrosion to assess its impact. Determining the extent of pitting is crucial, whether in service applications to predict the remaining metal structure life or in laboratory test programs to select the most pitting-resistant materials for service.
ASTM G46 Testing Method
Visual Inspection
In ASTM G46, a visual inspection of the corroded metal surface in its original condition is typically conducted before any cleaning or destructive examination.
Pitting evaluation
The extent of pitting is determined using a depth gauge or micrometer, while automated profilometers aid in evaluating pitting. The visible pits are counted, the metal surface is removed in measured stages, and the remaining visible pits at each stage are counted. The difference between the number of pits at each stage and the previous stage provides the number of pits at each depth of cut.
G46 Equipment and Sample Preparation
Specimen Details
Metal specimens are used, and cleaning procedures are performed to expose the pits fully
Specimen Size
For ASTM G46, pit depth measurements are typically taken within the 0.04 mm to 0.34 mm range.
G46 Test Results and Interpretation
ASTM G46 method is effectively utilized to determine the extent of pitting corrosion across a wide variety of metals.
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Tests Related to ASTM G46
ASTM G46 is related to tests like ASTM E3 for preparation of metallographic specimens, ASTM G1 for cleaning and evaluation of test specimens and ASTM G15 for terminologies concerning corrosion testing.
Use of G46 in Various Industries
It is used in oil and gas, aerospace, automotive, and marine engineering industries for the determination of pitting corrosion of metallic components, monitoring of pipeline degradation, ensuring structural reliability, and risk reduction to ships and offshore platforms.
Materials Commonly Tested with G46
It tests commonly used materials such as stainless steels, carbon steels, nickel-based alloys, aluminum alloys, and titanium alloys for localized corrosion in chloride-containing or acidic environments, which focus on pit extent, morphology, and distribution.
Common Challenges and Troubleshooting in G46 Testing
One of the difficulties in testing is distinguishing between true pitting and surface defects such as scratches or stains. Proper surface preparation and magnification tools help differentiate between these. Environmental variations, humidity, and temperature can affect results, necessitating controlled testing conditions and uniform specimen exposure.
Safety and Best Practices in G46 Testing
Testing safety involves handling corrosive solutions, ventilation, use of PPE, cleaning specimens, keeping records of exposure, and calibration of instruments for proper assessments. Proper handling, ventilation, and use of PPE are important in terms of safe and repeatable testing.
Importance of G46
It is a standard of significant importance that determines the metallic material vulnerability for pitting corrosion. Engineers will then be able to design robust systems, predict the needs for maintenance, and increase reliability and safety in critical infrastructure and industrial applications using a well-defined framework.
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Please contact us for a detailed quote for your astm g46 testing needs. Cost incurred to carry out different astm g46 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm g46?
The required number of samples or specimens should comply with the procedure given in the astm g46 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
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The turnaround time for astm g46 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm g46 tested?
You can share your astm g46 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm g46 test to various testing techniques.
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