Standard Practice for Evaluating Stress-Corrosion-Cracking Resistance of Metals and Alloys in a Boiling Magnesium Chloride Solution

Importancia y uso:

5.1 For most applications, this environment provides an accelerated method of ranking the relative degree of stress-corrosion cracking susceptibility for stainless steels and related alloys in aqueous chloride-containing environments. Materials that normally provide acceptable resistance in hot chloride service may crack in this test. The test may not be relevant to stress-corrosion cracking in polythionic acid or caustic environments.

5.2 Resistance to stress-corrosion cracking in boiling magnesium chloride (155.0 °C (311.0 °F)) should, where possible, be correlated to resistance in service for the materials of interest. However, such correlations may not always be possible.

5.3 Boiling magnesium chloride may also cause pitting of many stainless alloys. This leads to the possibility of confusing stress-corrosion failures with mechanical failures induced by corrosion-reduced net cross sections. This danger is particularly great when small cross section samples, high applied stress levels, long exposure periods, stress-corrosion resistant alloys, or a combination thereof are being used. Careful examination is recommended for correct diagnosis of the cause of failure.

Subcomité:

G01.06

Referida por:

G0168-17, G0030-22, G0123-00R22E01, G0039-99R21, G0058-85R23, G0157-24, G0049-85R23E01

Volúmen:

03.02

Número ICS:

77.060 (Corrosion of metals)

Palabras clave:

accelerated test; apparatus; boiling magnesium chloride; glassware; nickel containing alloy; stainless steels; stress-corrosion cracking ;