QC/T 17-1992 PDF in English
QC/T 17-1992 (QC/T17-1992, QCT 17-1992, QCT17-1992)
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General Rules of Atmospheric Exposure Test for Auto Parts
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Standards related to (historical): QC/T 17-1992
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QC/T 17-1992: PDF in English (QCT 17-1992) QC/T 17-92
QC
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
General rules for
automotive part weathering test
ISSUED ON. MAY 21, 1992
IMPLEMENTED ON. JUNE 1, 1993
Issued by. China Automotive Industry Corporation
Table of Contents
1 Subject content and application scope ... 3
2 Normative references ... 3
3 Terms ... 4
4 Test type and code name ... 5
5 Service conditions and code ... 6
6 Importance and classification of parts ... 6
7 Specimens ... 7
8 Test methods ... 9
9 Evaluation methods ... 19
10 Evaluation of test result ... 21
11 Recording items ... 22
Additional explanation ... 31
General rules for automotive part weathering test
1 Subject content and application scope
This Standard specifies contents, methods, conditions and devices of automotive
parts’ weathering test.
This Standard applies to automobile parts and automotive metal parts that are made
up of plastics, rubber, artificial leather fiber.
This Standard does not apply to parts such as electric wire, tire, anti-vibration rubber,
air spring.
2 Normative references
GB 250 Gray scale for assessing change in colour
GB 2410 Transparent plastics - Transmissivity and haze test
GB 2918 Standard atmospheres for conditioning and testing of plastic specimens
GB 2941 Rubber - Standard temperatures, humidity and times for the conditioning
environmental and testing of test pieces
GB 3511 Rubber vulcanized - The test method of resistance to natural weathering
GB 3681 Methods of exposure to natural weathering of coating
GB 9754 Paints and varnishes - Determination of specular gloss of non-metallic
paint films at 20°, 60°and 85°
GB 9277.2 Evaluation of degradation of paint coatings - Part 2. Designation of
degree of blistering
GB 9277.3 Evaluation of degradation of paint coatings - Part 3. Designation of
degree of rusting
GB 9277.4 Evaluation of degradation of paint coatings - Part 4. Designation of
degree of cracking
GB 9277.5 Evaluation of degradation of paint coatings - Part 5. Designation of
degree of flaking
GB 1767 Method for exterior exposure tests of paint films
3 Terms
3.1 Weather resistance. refers to anti-weathering ability of specimen under natural
climate conditions such as sunlight, ozone, rain and snow, humidity and temperature.
3.2 Light resistance. refers to that surface of specimen resists degradation.
3.3 Degradation. means the phenomenon that when specimen is exposed in natural
or artificial environment, its performance becomes worse as time goes by.
3.4 Exposure side. refers to the surface that specimen directly touches with sunlight,
ozone, rain and snow.
3.5 Effective side. refers to the surface that has working function.
a. Directly visible surface under service conditions.
b. Surface of parts that is directly influenced by changes of surface condition.
3.6 Standard specimen. refers to the specimen, used for regular observation and
comparison, that is stored in specified conditions.
3.7 Color-fading. refers to changes of specimen test that is caused by changes of color,
brightness and other degradations.
3.8 Contact-pollution. refers to changes caused by different materials’ interaction.
3.9 Dirt. refers to such as harmful gas, organic matter adhering to or permeating to
exposed surface, which can not be cleaned.
3.10 Flaking. means falling off, or expansion of protective film, or adhesive part on the
surface of specimen.
3.11 Applicable reference. refers to test regulation that is determined by use condition
and degree of importance of parts.
For example. ES2 and IG3 (as shown in Table 2 and Table 3).
3.12 Quantity of illumination. refers to amounts of sunlight received by exposed
surface, unit is kcal/cm2.
3.13 Glossiness. based on glossiness of 60° mirror surface, divided as follows.
No-light Below 20%
Semi-gloss Between 20% and 80%
Bright Above 80%
3.14 Specimen. refers to parts or test block prepared according to purpose for test.
3.15 Direct exposure test. is a test that put specimen in natural environment such as
sunlight, wind and rain; degradation degree of its surface coating is changed as time
goes by.
3.16 Exposure test across glass. is a test that specimen in test box is covered by glass
pane for exposure; inspect its degradation degree as time goes by.
3.17 Masking exposure test. a test that specimen is placed under shielding structure,
under the condition that it is avoided from direct influence by sunlight and rain-snow,
the degradation degree of its surface coating is changed as time goes by.
3.18 Immersion exposure test. is a test that partial part of specimen or the whole
specimen is immersed in test solution, placed outdoor; and be put outside, the
degradation degree of its surface coating is changed as time goes by.
3.19 Exposure device. refers to devices such as exposure rack and specimen storage
box that are used for putting specimen.
3.20 Test box. is a container that is used for environmental conditioning, having
ventilation facility; its top part is covered by glass pane.
3.21 Storage box. is a container that is used to place-store specimen.
3.22 Environmental factor. is a generic term of meteorological factors such as air
temperature, insolation, rainfall capacity of exposure environment AND environmental
pollution factors such as amount of coal ash fallen and sulfur dioxide concentration.
3.23 Exposure duration. refers to that time spent by exposure test of specimen.
4 Test type and code name
Test types shall be divided into outdoor and indoor test; it is divided into seven types
according to test conditions and types of testing machine (as shown in Table 1).
Carbon electrode
The upper part (mm) Sunlight carbon rod covered by copper Solid or non-filled carbon electrode
The bottom part (mm) Sunlight carbon rod covered by copper Solid or non-filled carbon electrode
Average discharge voltage (V) 50±2% 135±2%
Average discharge current (A) 60±2% 16±2%
Light filter Plate-shape transmittance. below 255nm, 0%; 400nm, above 90%
Spherical transmittance. below 279nm, 0%;
400nm, above 90%
Black panel
thermometer
Adjusting temperature °C 63±3
Size Referring to (1) of Figure 1 Referring to (2) of Figure 1
Description
Temperature sensing section of the bi-metal dial thermometer (1 scale as 1°C and the diameter of temperature
sensing section as 3. 5mm) shall be close to stainless steel plate lmmX150mmX70mm for installation.
Temperature sensing section shall be painted light resistance black enamel. Black panel thermometer as a trail is
used for measuring temperature and correct thermometer. In the process of correction, black panel thermometer
shall be placed facing light source. When each indicated temperature is read, error of measured temperature
and corrected temperature shall be within ±2°C.
Specimen rotary
drum or frame
Distance from center of arc lamp to
specimen surface (mm) 476~482 378~384
Diameter (mm) Specimen rotary support 960 ―
Rotation speed min-1 About 1
Relationship among arc lamp, specimen rotating liquid
canister, frame and sprayer Referring to (1) of Figure 5 Referring to (2) of Figure 5
Size of nozzle Referring to Figure 6
Jetting condition
of water
Pressure kPa 78~127
Amount of water ml/min 2100±100
Time of jetting Jet of 12 min, in exposure of 60min
Water quality Raw ionized water, PH value is 60-80, conductivity is 10S/cm
Condition in test-machine In the form of air-blow of closed loop, auxiliary devices shall be installed to avoid waste heat and harmful gas such as ozone produced during discharge.
Table 14
Item Test condition
Concentration of ozone pphm 50±5
Test temperature °C 40±2
Test equipment
Internal capacity of test equipment is 0.11~0.14 m3,; the length and
width are almost equal. Air heater is installed at a place that does not
have bad influence on concentration of ozone; its inner air is a device of
cyclic type, indicating ventilation flow.
Installation of specimen Hang vertically, without touching each other
Determination of concentration of
ozone Constant current electrolytic method
Times of determination of
concentration of ozone
After specimen is placed inside, measure once per 15 min; measure
daily after 3 hours.
Conditioning of specimen Test shall be conducted after it is placed in closed chamber for 24 hours
Number of specimen Surface area of specimen shall not be greater than 60% of the horizontal sectional area of test equipment’s inner chamber
Note. Determination parts of ozone concentration shall be decided by supplier and buyer.
9 Evaluation methods
9.1 Evaluation of specimen shall be conducted after and before test, within specified time.
Inspection of specimen after and before shall avoid the top and edge part of specimen.
9.2 Specimen shall be cleaned according to test purpose; if necessary, conduct in
accordance with provisions in GB 2918 and GB 2941. WON, WOL and WAN test shall be
conducted after stain on effective surface is cleaned.
9.3 Appearance of specimen after test
a. Compare with standard specimen according to requirements. When specimen is
finished, its appearance evaluation shall be conducted on effective surface.
b. Take opal lamp of 100-200w as the ...
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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