GB/T 42613-2023 PDF in English
GB/T 42613-2023 (GB/T42613-2023, GBT 42613-2023, GBT42613-2023)
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Plain bearings -- Testing of bearing materials -- Resistance to corrosion by lubricants under static conditions
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Standards related to (historical): GB/T 42613-2023
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GB/T 42613-2023: PDF in English (GBT 42613-2023) GB/T 42613-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.10
CCS J 12
GB/T 42613-2023 / ISO 10129:2017
Plain bearings - Testing of bearing materials - Resistance to
corrosion by lubricants under static conditions
(ISO 10129:2017, Plain bearings - Testing of bearing materials - Resistance to
corrosion by lubricants under static conditions, IDT)
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 01, 2023
Issued by: State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Health and safety ... 4
5 General rules ... 5
6 Lubricant ... 5
7 Devices ... 6
8 Specimen preparation ... 6
9 Test steps ... 6
10 Test results ... 7
11 Test report ... 8
References ... 10
Plain bearings - Testing of bearing materials - Resistance to
corrosion by lubricants under static conditions
1 Scope
This document describes the test methods for the resistance of bearing materials to
lubricant corrosion AND establishes the most important general testing principles.
This document is applicable to the testing of lubricant corrosion resistance of bearing
materials AND the selection of bearing materials.
2 Normative references
This document has no normative references.
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Corrosion
A reaction of the bearing material with the environment, that results in measurable
corrosion damage changes in the bearing material.
Note: In most cases, the nature of this reaction is a chemical reaction; however, it may also
involve chemical or mechanical processes. This document does not deal with material
changes, that would only occur or be detected concurrently with mechanical action. For a
detailed description of the various causes of damage to sliding bearings, see ISO 7146-1.
4 Health and safety
Raw materials, specimens, test materials, test equipment, test procedures shall comply
with current health and safety laws and regulations. Where equipment, materials and/or
reagents that may be hazardous to health have been designated, appropriate precautions
shall be taken, in accordance with laws and regulations.
5 General rules
5.1 Corrosion tests are usually conducted, in the form of comparative tests, that is,
multiple bearing materials and lubricants are compared with each other. However, the
test may also include reference materials or reference lubricants with known properties.
5.2 In order to obtain precise information on the corrosion behavior of the material
under test and the reference materials that may be involved at the end of the test under
given test conditions, the test duration shall be chosen appropriately AND extended if
necessary.
5.3 Due to the high discreteness of a single material test result (which is often the case
when measuring material quality changes), its reference is low, so the test results shall
be the mean of at least 3 tests.
6 Lubricant
The amount of lubricant, which is used on the surface of bearing materials, shall be at
least 10 mL/cm2.
Indicate the specifications of the lubricant used in the test, including lubricant type and
performance grade information.
In order to obtain the desired results (e.g., additives used in the lubricants and their
effects), the following chemical and physical information should be given:
- Density (15 °C), the unit is grams per milliliter (g/mL), that is, grams per cubic
centimeter (g/cm3);
- Flash point, in degrees Celsius (°C);
- Neutralization value;
- Saponification value;
- Base number;
- Kinematic viscosity (40 °C), in square millimeters per second (mm2/s);
- Kinematic viscosity (100 °C), in square millimeters per second (mm2/s);
- Sulfate ash, which is calculated by mass fraction;
- Zinc content, which is calculated by mass fraction;
- Phosphorus content, which is calculated by mass fraction;
on the beaker to prevent dust.
c) In principle, only specimens of the same bearing material are placed in the same
beaker for test, to avoid interaction. The test environment shall not contain any
substances, that interfere with the test.
d) During the test, keep the temperature of the beaker within ±2 °C of the specified
test temperature. The recommended test temperatures are 80 °C, 100 °C, 120 °C,
150 °C, 180 °C.
The test duration shall be at least 20 d, which can be extended, if necessary (see 5.2).
Interim evaluations shall be conducted, one week later and two weeks later. The test
duration and temperature should be selected according to the specific application
environment of the bearing.
e) Before the interim evaluation and final evaluation, use an appropriate solvent to
spray the specimen OR use other methods to clean it. Drying is carried out in a
hot air cabinet, until the sample mass is constant. Record specimen mass and
dimensions.
10 Test results
10.1 Mass changes
Only when the surface of the tested specimen is uniformly corroded, the specimen mass
change data will have reference value.
The change in specimen mass (mass loss or gain) shall be taken as the mean of at least
3 specimens.
10.2 Dimensional changes
Only when the surface of the tested specimen is uniformly corroded, the specimen's
dimensional change data will have reference value.
The dimensional changes (size reduction or increase) of the specimen shall be taken as
the mean of at least 3 samples.
10.3 Surface changes
During the interim evaluation and final evaluation, check the frequency, expansion,
distribution of individual corrosion spots and discoloration spots on the surface of the
specimen. The macro and micro morphology of the surface is recorded through
photographs. Optical and electron microscopes can be used to observe changes in
surface topography; depth measurements can be made, using scanning electron
microscopes or surface roughness meters.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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