kaizenlab-quality

Corrosion Testing

Among the wide range of methods Kaizen Lab is equipped to perform:

Pitting corrosion resistance with ferric chloride solutions – ASTM G48 Method A

The ASTM G48 method A standard is used for the determination of the pitting resistance of stainless steels, nickel and chromium alloys. A ferric chloride solution (FeCl3 * 6H2O) is used for testing at typical temperatures of 22°C, 40°C and 50°C.

Pitting corrosion resistance with ferric chloride solutions – ASTM G48 Method C

The ASTM G48 Method C standard is used for the determination of the minimum critical temperature that triggers the pitting corrosion of nickel and chromium rich alloys. A ferric chloride (FeCl3 * 6H2O) and hydrochloric acid (HCl) solution is used for testing within a typical range of 0-85°C.

Corrosion resistance in ferric chloride solutions for the classification of structures of duplex stainless steels – ASTM A923 Method C

The ASTM A923 Method C is employed in order to evaluate the effect of the intermetallic phase presence in duplex stainless steels. Those intermetallic phases can significantly influence the corrosion resistance. A ferric chloride solution (FeCl3 * 6H2O) with pH corrected to 1,3 by the use of hydrochloric acids (HCl) or sodium hydroxide NaOH. The test is generally executed at 22°C or 40°C for a time duration of 24h.

Resistance to intergranular corrosion of stainless steels ASTM A262 Method A

The ASTM A262 Method A standard is employed as a fast acceptability test on wrought and cast austenitic stainless steels. The test is executed with an electrolytic etching with a solution of oxalic acid ((COOH)2) or a solution of ammonium persulfate ((NH4)2S2O8).

Resistance to intergranular corrosion of stainless steels ASTM A262 Method B

The ASTM A262 Method B standard is employed for determining the susceptibility of the austenitic stainless steels towards the intergranular corrosion. In particular, this method detects the corrosion related to the chromium carbides and the sigma phase. A solution of ferric sulfate (Fe2(SO4) * xH2O) and sulfuric acid (H2(SO)4) is employed to execute the test for 120 hours at the boiling temperature.

Resistance to intergranular corrosion of stainless steels ASTM A262 Method C

The ASTM A262 Method C standard is employed for determining the susceptibility of the austenitic stainless steels towards the intergranular corrosion. In particular, this method detects the corrosion related to the chromium carbides. A solution of nitric acid (HNO3) is employed in order to execute 5 or 10 cycles about 48 or 96 hours at the boiling temperature.

Resistance to intergranular corrosion of stainless steels ASTM A262 Method E

The ASTM A262 Method E standard is employed for determining the susceptibility of the austenitic stainless steels towards the intergranular corrosion, in conjunction with a bend test. Cupric sulfate (CuSO4 * 5H2O), sulfuric acid (H2SO4) and copper chippings are used for a corrosion test of 15 hours at the boiling temperature at least. Successively, the specimen is verified through a bend test in respect of the ASTM A370 and the ASME IX.

Resistance to intergranular corrosion of stainless steels ASTM A262 Method F

The ASTM A262 Method F is employed for determining the susceptibility of the austenitic stainless steels towards the intergranular corrosion. This method detects the corrosion which is related to the chromium carbides precipitates of stainless steels not stabilized or fused or certain forged grades. Cupric sulfate (CuSO4 * 5H2O), sulfuric acid (H2SO4) and copper chippings are used for a corrosion test which is 120 hours long at the boiling temperature.

Intergranular corrosion resistance – ASTM G28 Method A

The ASTM G28 Method A is used for the determination of the corrosion susceptibility to the intergranular corrosion for wrought Nickel and chromium rich products. Sulfuric acid (H2SO4) and ferric sulfate (Fe2(SO4)3) is employed in order to execute a 24 or 120 hours test at the boiling temperature.

References:

ASTM G48 Method A – http://www.astm.org/cgi-bin/resolver.cgi?G48-11(2015)

Pitting – https://en.wikipedia.org/wiki/Pitting_corrosion

Acciai inossidabili – https://en.wikipedia.org/wiki/Stainless_steel

Ferric chloride (FeCl3 * 6H2O) – https://en.wikipedia.org/wiki/Iron(III)_chloride

ASTM G48 Method C – http://www.astm.org/cgi-bin/resolver.cgi?G48-11(2015)

Hydrochloric acid (HCl) – https://en.wikipedia.org/wiki/Hydrochloric_acid

ASTM A923 Method C – https://www.astm.org/Standards/A923.htm

Intermetallic phases – https://en.wikipedia.org/wiki/Intermetallic

Sodium hydroxide NaOH – https://en.wikipedia.org/wiki/Sodium_hydroxide

ASTM A262 Method A – http://www.astm.org/cgi-bin/resolver.cgi?A262-15

Oxalic acid ((COOH)2) – https://en.wikipedia.org/wiki/Oxalic_acid

Ammonium persulfate ((NH4)2S2O8) – https://en.wikipedia.org/wiki/Ammonium_persulfate

ASTM A262 Method B – http://www.astm.org/cgi-bin/resolver.cgi?A262-15

Austenitic stainless steels – https://en.wikipedia.org/wiki/Stainless_steel

Ferric Sulfate (Fe2(SO4)3) – https://en.wikipedia.org/wiki/Iron(III)_sulfate

Sulfuric acid (H2(SO)4) –  https://en.wikipedia.org/wiki/Sulfuric_acid

ASTM A262 Method C – http://www.astm.org/cgi-bin/resolver.cgi?A262-15

Nitric acid (HNO3) –  https://en.wikipedia.org/wiki/Nitric_acid

ASTM A262 Method E – http://www.astm.org/cgi-bin/resolver.cgi?A262-15

Copper sulfate (CuSO4 * 5H2O) – https://it.wikipedia.org/wiki/Solfato_rameico

ASTM A370 – http://www.astm.org/cgi-bin/resolver.cgi?A370

ASME IX – https://www.asme.org/products/codes-standards/bpvcix-2015-bpvc-section-ixwelding-brazing-fusing

ASTM A262 Method F – http://www.astm.org/cgi-bin/resolver.cgi?A262-15

ASTM G28 Method A – http://www.astm.org/cgi-bin/resolver.cgi?G28-02(2015)