Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5 % Sodium Chloride Solution

Importancia y uso:

4.1 The 3.5 % NaCl alternate immersion procedure is a general, all-purpose procedure that produces valid comparisons for most metals, particularly when specimens are exposed at high levels of applied stress or stress intensity.

4.2 While the alternate immersion test is an accelerated test and is considered to be representative of certain natural conditions, it is not intended to predict performance in specialized chemical environments in which a different mode of cracking may be operative. For example, it does not predict the performance of aluminum alloys in highly acidic environments such as heated inhibited red fuming nitric acid (IRFNA). For such cases, the results of the alternate immersion test are of doubtful significance until a relationship has been established between it and anticipated service environments.

4.3 While this practice is applicable in some degree to all metals, it is not equally discriminative of all alloys, even within the same metal system. Consequently, information should be established to allow comparisons of performances of the alloy of interest in the alternate immersion test and in natural environments.

Note 2: The alternate immersion concept can be useful for exposure of corrosion specimens in other solutions because the procedure and apparatus provide a controlled set of conditions. Details of this are beyond the scope of this practice.

Subcomité:

G01.06

Referida por:

G0047-22, G0168-17, G0030-22, G0139-05R22, F2660-20, D6361_D6361M-98R20, F3043-23, G0039-99R21, G0058-85R23, F3111-23, G0103-97R23E01, G0064-99R21, G0049-85R23E01

Volúmen:

03.02

Número ICS:

77.040.30 (Chemical analysis of metals)

Palabras clave:

accelerated corrosion test; alternate immersion test; aluminum alloys; ferrous alloys; quality control test; sodium chloride solution; stress corrosion cracking;