QC/T 484-1999 PDF in English
QC/T 484-1999 (QC/T484-1999, QCT 484-1999, QCT484-1999)
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Automobile -- Paint Coating
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Standards related to (historical): QC/T 484-1999
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QC/T 484-1999: PDF in English (QCT 484-1999) QC/T 484-1999 (Renamed from JB/Z 111-86)
GUIDING TECHNICAL DOCUMENT OF THE MINISTRY OF
MACHINERY INDUSTRY OF THE PEOPLE'S REPUBLIC OF
CHINA
QC/T 484-1999
Replacing JB/Z 111-74
Automobile -- Paint Coating
Issued on: February 06, 1986
Issued by: Ministry of Machinery Industry
Table of Contents
Note on transfer of standard number ... 3
1 Provisions on paint coating codes ... 4
2 Technical requirements ... 4
3 Marks ... 12
4 Inspection ... 12
Additional information: ... 14
Note on transfer of standard number
According to the requirements of Standard Letter [1998] No. 216 of National
Quality and Technology Supervision Bureau as well as the Reply No. 126 [1999]
of State Bureau of Machine Building Industry, the original standard code JB/Z
111-86 is now converted to the industry standard code QC/T 484-1999. The
content is temporarily unchanged. Please use the new standard code when
quoting.
Automobile -- Paint Coating
This Standard applies to automobile paint coatings, not apply to paint coating
for automobile electrical and instrument products.
1 Provisions on paint coating codes
According to the different use conditions of automobile parts and paint quality
requirements, the paint coating is divided into 10 groups and several levels,
according to the provisions of Table 1.
Table 1
Coating
code Group name Level Paint coating name Note
TQ1 Vehicle body A
High-quality decorative protective
coating
B General decorative protective coating
TQ2 Car body
A Advanced decorative coating Suitable for luxury cars
B High-quality decorative protective coating
Suitable for intermediate
car coating
TQ3 Car box
A Corrosion-resistant, decorative coating Suitable for iron car box
B Anticorrosive, decorative coating
Suitable for wooden
wagons and iron wooden
wagons
TQ4 Frame, wheel fender High-quality anti-corrosion coating
TQ5 Engine Protective coating (quick drying) TQ6 Chassis
TQ7
Blank, semi-
finished stamping,
spring
A General anti-corrosion coating
B Anti-corrosion coating
TQ8 Special coating
A Acid resistant coating Suitable for battery box and its bracket
B Gasoline-resistant coating Suitable for inner surface of gasoline tank
C Heat-resistant coating Suitable for muffler exhaust pipe
D Soundproof, heat-insulating, wear-resistant coating
TQ9 Water tank, steel plate, spring Waterproof and antirust coating
TQ10 Interior decoration Suitable for interior parts of cars and passenger cars
2 Technical requirements
2.1 The main quality indicators of paint coatings are specified in Table 2
according to the group and level of paint coating codes.
Table 2
Coating
code Level
Coating
characteristics Main quality indicators of coating Examples of uses Note
TQ1 A
It is a high-quality,
decorative protective
coating, with excellent
weather resistance,
water resistance,
decoration and
mechanical strength,
suitable for wet
tropical climate
regions.
1. Paint film appearance:
Flat and smooth. No particles are allowed on the appearance surface, but slight
"orange peel" is allowed. Uniform light color without scratched face.
Gloss: for the one with lights, not less than 90; for the one with plain light, not
greater than 30.
2. Coating thickness:
Primer layer: not less than 15 microns. Topcoat: not less than 40 microns. Total
thickness: not less than 55 microns.
3. Mechanical strength:
With plain light With light
Impact 40 kgꞏcm 30 kgꞏcm
Elasticity 3mm 5mm
Hardness ≥0.4 ≥0.5
Adhesion Level 1 Level 1
4. Weather resistance:
In Guangzhou and Hainan Island, the coating is still intact for two years of
solarization or four years of use (that is, no foam, no powdering, no rust, no
cracking), and the loss of light is not allowed to be greater than 30% or it is
obviously discolored.
5. Corrosion resistance
○1 Pass the salt spray test for 700 hours according to 4.1.11 a method.
○2 In the south of the Yangtze River, if it is used for five years (200,000
kilometers), there shall be no perforation corrosion or structural damage due to
rust.
6. Water resistance:
When immersed in 50°C water for 20 cycles, it is allowed to thicken, but it shall
not foam.
7. Alkali resistance:
It is not blushing according to 4.1.8 b method for 4 hours, but slight discoloration
is allowed.
8. Acid resistance:
It is not blushing within 24 hours. No spots but slight discoloration is allowed.
9. Gasoline resistance:
When immersed in RQ-70 gasoline, there shall be no change in 4 hours.
10. Engine oil resistance:
Cabs and covering parts
for cargo trucks, coach
compartments, off-road
vehicles, jeep bodywork,
and the above-mentioned
assemblies that use small
and medium-sized parts
with the same weather
resistance and decorative
requirements.
1. The outer surface of the
underbody and the inner surface
of the fender shall be coated
with soundproof, wear-resistant,
and heat-insulating paint after
primer (see TQ8-T), and the joint
of the weld shall be coated with
sealant.
2. Aluminum products use zinc
yellow pure phenolic or epoxy
primer.
3. The covered part of the inner
surface of the car body may not
be painted.
4. In order to improve the
corrosion resistance of the car
body, the interior cavity of the
painted car body and the internal
cavity of the unpainted structure
shall be sprayed with anti-rust
wax.
a. Immerse the painted sample plate in 80 ± 2°C 2% Na2CO3 aqueous solution. After
10 minutes, check how the paint film is dissolved.
b. Immerse the painted sample plate in an aqueous solution that contains 0.1 NNaOH
at 55 ± 1°C. After 4 hours, check the change of paint film.
4.1.9 Acid resistance: drop 0.1 NH2SO4 solution onto the sample plate. Observe the
change of paint film after 24 hours at 20°C.
4.1.10 Water resistance: immerse the sample plate in a constant temperature water bath
at 50 ± 1°C. Observe the change of paint film. Heat at 50 ± 1°C for 8 hours then stop
heating. Naturally cool in a heat-insulated device for 16 hours as a cycle.
4.1.11 Corrosion resistance: Use the three inspection methods to determine the
corrosion resistance of paint film.
a. Salt spray resistance test: conduct in a salt spray test box. The sample plate is
required to use scotch tape or refined wax to seal the edges, sharp blade for the
center part. Draw two cross-cutting cuts at an angle of 60°. And place it in the salt
spray box at an angle of 30° to the vertical. It is required that the sample plates
cannot be blocked and contacted with each other. When the temperature in the
control box is 36 ± 0.1~ 0.7°C, continuously spray. In NaCl solution with a saltwater
concentration of 5±1%, in a salt spray box with PH value of 6.5~7.2, in an area
with an amount of salt spray is 80cm2, at 1~2ml per hour (according to the average
of at least 16 hours), continuously test and check once every 48 hours. After two
checks, check once every 72 hours. Change the sample plate position after each
check. Check according to product-specified standard and time. Observe the
spread of corrosion under the paint film along the cutting line. (The indicators
specified in this Standard are based on the one-sided corrosion spread not
exceeding 2mm). Saltwater is not recycled.
b. Salt solution resistance test: immerse the painted sample plate in a solution that
contains 3% NaCl at a temperature of 25 ± 1°C. Check the damage and corrosion
of paint film every 24 hours.
c. Assessment of actual service life: expressed in years (or mileage) due to corrosion
perforation or structural damage due to corrosion.
4.1.12 Gasoline resistance: determine according to GB 1734-79 “Determination of
resistance to petrol of films”.
4.1.13 Engine oil resistance: determine according to chemical temporary 2017-57
“Determination of resistance to lubricating oil”.
4.1.14 Weather resistance: assess the ability of paint film to resist natural damage.
a. Atmospheric exposure test: determine according to GB 1767-79 “Method for
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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