Standard Test Method for Initial pH (i-pH)-Value of Petroleum Products

Importancia y uso:

5.1 New and used petroleum products may contain acidic constituents that are present as additives, degradation products formed during service, such as oxidation products or components formed from combustion gases. The i-pH-value is a measure of the amount of acidic substances and their acidity defined under the conditions of test. The i-pH-value is used as a measure of lubricant degradation in service.

5.2 The corrosiveness of acidic components depends on their concentration and acidity. The i-pH-value is a measure of the amount of dissociated acidic components with the potential of corrosiveness towards metals.

5.3 Since a variety of oxidation and blow-by products contribute to the i-pH-value, this test method cannot be used to predict corrosiveness of oil or blends under service conditions against metallic components. No general correlation is known between i-pH-value and the corrosive tendency of blends or oils toward metals.

Subcomité:

D02.06

Volúmen:

05.04

Número ICS:

75.120 (Hydraulic fluids)

Palabras clave:

i-pH Value; lubricants; petroleum products; potentiometric;