Standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution. Ferric chloride corrosion testing rolled alloys, inc. Pitting and crevice corrosion testing to astm g48 element. Standard test methods for pitting and crevice corrosion resistance of stainless steels.
Example of pitting after corrosion testing in accordance with astm g48 method a. Astm has issued g48, standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution. The astm g48 a test1 ferric chloride test is widely used for prequalification of stainless steel welds in the offshore sector. Experimental investigation of the challenges associated with the astm g48 standard for accelerated corrosion test. This standard is the standard test methods for pitting and crevice corrosion of stainless steels and alloys by use of fecl 3. Accelerated pitting corrosion test of 304 stainless steel.
In the ferric chloride pitting test, the weight reduction. Astm g48112015 standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution. Standard test methods for pitting and crevice corrosion. Active standard astm g48 developed by subcommittee. Corrosion performance and fabricability of the new gen. The astm g48 standard methods a and b are routinely implemented as mandatory quality control requirements and as rapid tools to qualitatively compare the localized corrosion resistance of stainless steels and nickel alloys and corrosion resistant alloys in general for all of you unfamiliar with the standard, astm g48 uses a 6% ferric chloride fecl 3. The test solution is actually quite aggressive, certainly more so than the materials would be subjected to in normal service. G48 method a is commonly called out for cast superduplex stainless with a 24 hour test period at 50c and 24hrs. Comments on astm g48 standard test methods for pitting. Astm g48a pdf example of pitting after corrosion testing in accordance with astm g48 method a.
Astm g48 testing in ferric chloride solution allows a quick assessment of pitting corrosion resistance of stainless steels. Pdf version of pricing schedule tejas testing and inspection, inc. An astm designation number identifies a unique version of an astm standard. Astm g48 standard test methods for pitting and crevice. Standard test methods for pitting and crevice corrosion resistance of. Pdf accelerated pitting corrosion test of 304 stainless steel using. The last approved version of this historical standard. Test procedures are typically tailored to the working condition. Test of the resistance of highalloy, corrosion proof materials against intercrystalline corrosion.
Standard test method for electrochemical critical pitting. Unwelded base material or solution annealed welds will pass the test at higher temperatures. Standard practices for detecting susceptibility to. G48 a method is designed to determine the relative pitting resistance of stainless steels and nickelbase, chromium bearing alloys. In this test, washers make a number of contact sites on either side of the specimens. Although service is rarely in media similar to this very aggressive test solution, there are similarities between ferric chloride solution and the environment within a corrosion pit that may develop during service in. Astm g48 test method for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution is a standard testing procedure to determine the resistance of stainless steel to pitting and crevice corrosion by exposing the test pieces to oxidising solution fecl3. G48 data sheet devo 017 e february 20 supersedes edition of june 2008 glysantin g48 is an engine coolant concentrate based on ethylene glycol that needs to be diluted with water before use. Corrosion performance and fabricability of the new generation of highly corrosion resistant. The oxalic acid test is also only applicable to corrosion associated with chromium carbide precipitates and is only useful for specific material grades. Corrosion results for astm g48 standard test method for pitting and crevice. Abstract astm g48 standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride. This standard describes test methods for pitting and crevice corrosion resistance in stainless steels and related alloys by use of ferric chloride solution. Astm g 48 is a relatively severe test, but lack of definition in the standard can lead to variation of data.
Standard g78 describe crevice testing assemblies in. Austenitic stainless steels have excellent corrosion resistance, good formability and outstanding fracture toughness especially at cryogenic temperatures. Study of pitting resistance of duplex stainless steel weldment. Standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution1.
Furthermore, all the described methods leave some details to decision by the. Astmg48112015standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution 1. However, the test methods and their acceptance criteria vary between the different oil companies. Comparative study of the crevice corrosion resistance of uns. Alloys with higher chromium generally exhibit lower corrosion rates. Testing by astm g48 for pitting and crevice corrosion g2mt labs. This study presents the modified astm g48 procedure. Pitting corrosion resistance of a 316l stainless steel manufactured. Astm g48 standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution 1 is a common test to evaluate the crevice corrosion resistance of stainless steels and nickel alloys. Buy astm g r test methods for pitting and crevice corrosion resistance of stainless steels and.
Evaluation of the resistance of materials to corrosion. Glysantin g48 contains a corrosion inhibitor package based on salts of organic acids and silicates hybrid coolant. Maximum allowable service temperatures and the astm g48 test. Duplex and astm g48 a test duplex and astm g48 a test iam42 industrial op.
When a stainless steel wpq fails astm g48 testing twi. Testing by astm g48 for pitting and crevice corrosion. Table 1 application of evaluation tests for detecting susceptibility to intergranular attack in austenitic stainless steels note 1for each corrosion test, the types of susceptibility to intergranular attack detected are given along with the grades of stainless steels in which they may be found. It will detect a loss of corrosion resistance associated with local depletion of chromium and molybdenum as a result of the precipitation of chromiumrich and possibly molybdenumrich phases, not limited to intermetallic phases. Pitting corrosion testing to astm g48 a, c and e test methods. The astm g 48 standard is entitled standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric. The number of sites showing attack in a given time can be related to the resistance of a material to initiation of localized corrosion, and the average or maximum depth of attack can be related to the rate of propagation. The modified astm g48 offered advantages in the extraction and interpretation of the data for pit characteristics in the accelerated pitting corrosion test simulating actual marine environment. Challenges in prequalification corrosion testing of cras based. Standard test methods such as astm g48 and g78 can be adapted to include e corr monitoring to indicate the initiation of localized corrosion. The higher alloyed materials 22, c2000, 59 and 686 have sufficient alloying to be completely resistant to pitting. The test involves the exposure of the materials in a 6 wt % ferrite chloride solution for test durations of 72 hours typically 24 hours. This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels. The resistance of a metal to crevice and pitting corrosion can be empirically determined and ranked relative to a critical crevice temperature ctt according to the astm standard g48 03.
The g48 test is designed to assess materials for pitting corrosion resistance in chloride media stress is not relevant. G48 03 standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution, crevice corrosion, ferric chloride test solution, localized corrosion, nickelbase alloys, pitting, stainless steels. When using stainless and duplex steels, astm g48 is widely used to ensure the quality of the material and resistance to pitting and crevice corrosion. In order to homogenize the testing parameters, the astm standard g48, methods d and f, and astm. Corrosion testing to astm g48 using method a corrosion. The astm ga test ferric chloride test is widely used for prequalification of corrosion.
Astm g48 112015 standard test methods for pitting and. Pdf accelerated pitting corrosion test of 304 stainless. Astm g48 112015 standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution. Astm g48 112015 standard test methods for pitting and crevice. Dear experts, the subjected testing was performed on duplex steel for welding procedure qualification at. Astm g48 standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution. Accelerated pitting corrosion test of 304 stainless steel using astm. Experimental investigation of the challenges associated with the astm g48 standard for accelerated corrosion test improving astm g48 for pitting immersion tests performed on 304 stainless steel specimens statistical modeling of the pitting corrosion depth and diameter considering the experimental data.