Standard Test Method for Condition Monitoring of Oxidation in In-Service Petroleum and Hydrocarbon Based Lubricants by Trend Analysis Using Fourier Transform Infrared (FT-IR) Spectrometry

Importancia y uso:

5.1 A large number of compounds, such as aldehydes, ketones, esters, and carboxylic acids, are produced when oils react with atmospheric oxygen. Oxidation is measured using a common FT-IR spectral feature between 1800 cm^–1 and 1670 cm^–1 caused by the absorption of the carbonyl group present in most oxidation compounds. These oxidation products may lead to increased viscosity (causing oil thickening problems), acidity (causing acidic corrosion), and formation of sludge and varnish (leading to filter plugging, fouling of critical oil clearances and valve friction). Monitoring of oxidation products is therefore an important parameter in determining overall machinery health and should be considered in conjunction with data from other tests such as atomic emission (AE) and atomic absorption (AA) spectroscopy for wear metal analysis (Test Method D5185) and physical property tests (Test Methods D445), base reserve (Test Method D2896 and D4739), acid number tests (Test Methods D664 and D974) and other FT-IR oil analysis methods for nitration (Test Method D7624), sulfate by-products (Test Method D7415), and additive depletion (Test Method D7412), which also assess elements of the oil’s condition, see Refs (1-6).

Subcomité:

D02.96.03

Referida por:

D7418-23, D7412-22, D7418-23, D7415-22, D7624-22, D6224-23, D7889-21, D8291-24, D7624-22, D8128-22, F3416-21, D7415-22, D7412-22, D7415-22, D7844-22A, D7418-23, D7720-21, D7624-22

Volúmen:

05.04

Número ICS:

75.100 (Lubricants, industrial oils and related products)

Palabras clave:

condition monitoring; differential trend analysis; direct trend analysis; Fourier transform infrared; FT-IR; hydrocarbon based lubricants; in-service petroleum lubricants; infrared; IR; lubricants; oils; oxidation;