Example of pitting after corrosion testing in accordance with ASTM G48 Method A . The test temperature of 22 °C is too aggressive for lean duplex grades such. Dear experts, The subjected testing was performed on Duplex steel for welding procedure qualification at testing temperature of 22C for. Abstract ASTM G48 – “Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride.
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Please share this page: Am I right by saying: Such issues are the result of project complexity, size, uniqueness and regulation, as well as the need for virtual team collaboration. They use similar test solutions but they are done for very different reasons. Method B — Ferric axtm crevice test.
Corrosion Testing to ASTM G48 using Method A – Corrosion engineering – Eng-Tips
A and B are for qualification of alloys to pitting and crevice corrosion at specific temperatures, C and D are for determining the critical pitting and crevice corrosion temperatures of chromium and nickel alloys, and E and F are for stainless alloys.
Now, nothing precludes a certain v48 of the standard Metrode in this case from running a test at a slightly different condition than that stated, provided he the user clears up on its written material specification, catalog, pamphlet, instruction manual etc.
If you need clarification as to what I am writing, all you have to do is ask, and I would be more than happy to follow up. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Many Upstream Oil gas specifications allow 24 hrs of testing duration for such test see extrats as below: I say like Socrates one of the greatest philosophers Human Kind has ever hadsaid: Then after cutting you should pickle the sample.
This paper will provide a brief overview of the standard and highlight several important points that can be sources of error or misunderstanding. Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Testing by ASTM G48 for Pitting and Crevice Corrosion
Am I right by saying: The G48 test is designed to assess materials for pitting corrosion resistance in chloride media stress is not relevant. Your disagreement with my viewpoint: Historical Version s – view previous versions of standard. The Eng-Tips staff will check this out and take appropriate action.
Publishers Content Coverage Privacy. We follow a standard practice we have developed to minimize nethod variations and provide consistent data. The test solution is actually quite aggressive, certainly more so than the materials would be subjected to in normal service. What exactly is it? This is really qstm because, if it was on the root surface then, the culprit would more than likely be the ppm level of Oxygen within the purging gas as being too high, if that is where the pitting marks were found.
However, the G48 test is meant for ranking or qualification, and not as designed for determining a corrosion rate over time.
Perhaps two black ribbon, kung fu fighters that perform into a cage? Method D — Critical crevice temperature test for nickel-base and chromium-bearing alloys.
I am not a chemical engineer but common sense would indicate that if it is used in an methid corrosion test it must be aggressive. Should the clients’ insistence is for 72 hrs duration then: A summary of the methods is listed in Table 1 below.
Methods D and F use a multiple crevice assembly which has a number of grooves and plateaus and is attached to the test sample with an insulated bolt. It is truly unfortunate indeed!!! Well my dad can beat up your dad, so there! Contact our corrosion experts today! We’ll be the World Champions for the 6th time. I also note your good friend the “highly esteemed Doctor Crisi” has disappeared from this issue after his glaring faux pas.
Happy New Year too All! The available pitting and crevice testing methods include: Click Here to join Eng-Tips and talk with other members!
By Lawrence Date I only know that I know nothing. The futures history books will reflect a much different book than the present’s history.
Not logged in American Welding Society Forum. The testing temperature will be selected based on the material that is under test.
For your information the test temperature of the G48’s were 40C. Thank you for the details with respect to the use of pure CO2 for the flux cored wires discussed.
G48 is looking ,ethod determine the resistance to the initiation of chloride pitting. We hired an independant 3rd party to perform corrosion testing to Aztm Method A as per client requirements but by mistake 3rd party booked the specimen to A and testing was done also to A and result is OK.
Link to Active This link will always route to the current Active version of the standard. That’s exactly what I wanted to mean, rodofgod. There are several factors that can influence the selection of methods; we can help you with this part of the process as well. Puget Sound Olympic – Meethod However all tests have to be documented, results v48 be assessed by client and fabricators, with the Maximum Engineering Integrity of the components being the prime criteria.
Like what you saw? Eventually in the ‘Metallurgy’ section? G48 Method A is commonly called out for cast superduplex stainless with a 24 hour test period at 50C and 24hrs.