GB/T 45345-2025 PDF English
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Metallic and other inorganic coatings - DC magnetron sputtered silver coatings for engineering purposes - Measurement of coating adhesion
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GB/T 45345-2025: Metallic and other inorganic coatings - DC magnetron sputtered silver coatings for engineering purposes - Measurement of coating adhesion
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.220.20; 25.220.40
CCS A 29
GB/T 45345-2025
Metallic and other inorganic coatings - DC magnetron
sputtered silver coatings for engineering purposes -
Measurement of coating adhesion
(ISO 21164.2018, MOD)
Issued on: FEBRUARY 28, 2025
Implemented on: SEPTEMBER 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Test methods for adhesion... 6
4.1 Friction polishing test... 6
4.2 Roller polishing test... 6
4.3 Peeling test... 7
4.4 Bending test... 7
4.5 Thermal shock test... 7
4.6 Nano scratch test... 7
5 Test report... 9
Annex A (informative) Structural changes of this document compared with ISO
21164.2018... 10
Metallic and other inorganic coatings - DC magnetron
sputtered silver coatings for engineering purposes -
Measurement of coating adhesion
WARNING -- The use of this document may involve harmful materials, dangerous
operating procedures and equipment. This document does not mention all safety-
related issues during use. Before use, the user of this document is responsible for
establishing appropriate safety and health measures and determining its
compatibility with relevant laws.
1 Scope
This document describes the test methods for adhesion of DC magnetron sputtered
silver coatings for electrical, electronic, optical and other engineering applications.
This document applies to the measurement of adhesion of DC magnetron sputtered
silver coatings on sheets and flat objects.
This document does not apply to the measurement of adhesion of DC magnetron
sputtered silver coatings on threads, strips or wires.
This document does not specify the state and surface roughness of the substrate material
before deposition. Therefore, it is the purchaser’s responsibility to specify the surface
roughness of the substrate to meet the product requirements.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 3138 Metallic and other inorganic coatings - Surface treatment, metallic and
other inorganic coatings - Vocabulary (GB/T 3138-2015, ISO 2080.2008, IDT)
GB/T 5270 Metallic coatings on metallic substrates - Electrodeposited and
chemically deposited coatings - Review of methods available for testing adhesion
(GB/T 5270-2024, ISO 2819.2017, MOD)
GB/T 12334 Metallic and other inorganic coatings - Definitions and conventions
concerning the measurement of thickness (GB/T 12334-2001, ISO 2064.1996, IDT)
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 3138 and
GB/T 12334 and the following apply.
3.1
sputtering
Process in which high-speed ions bombard the target material to produce particles,
which can cause the target metal material particles to be deposited on the surface of the
substrate.
3.2
adhesion
Interface force between the coating and the substrate, composed of atomic bonding
forces, mechanical bonding forces or both.
4 Test methods for adhesion
4.1 Friction polishing test
Use an agate knife with a diameter of 6 mm and a smooth hemispherical end as a friction
polishing tool, select an area with an effective surface area of no more than 6 cm2, and
rub it quickly and steadily for 15 s with a suitable polishing tool. The pressure used
during friction shall be able to wipe off the coating in each stroke, but not so large as to
cut the coating. Use a low-power microscope to check the sample coating, as the friction
continues, the blisters continue to grow, break or even peel off, indicating that the
adhesion of the coating is poor.
This test method is not applicable to the silver coatings with a thickness greater than 10
μm.
4.2 Roller polishing test
Unless the purchaser specifies dry polishing, the sample shall be wet polished for 40
min on a suitable polishing machine. Use a hexagonal rubber-lined polishing drum with
a diameter of 250 mm and polish at a speed of 25 r/min. Use a low-power microscope
to check whether the sample has blistering or peeling. The tested sample shall not have
blistering or peeling.
If the roller polishing test method is acceptable, the entire batch of coated parts can be
tested by this method. Only coated parts that fail the test will be scrapped.
4.3 Peeling test
It shall operate according to the peeling test method specified in GB/T 5270.
At a temperature not higher than the normal welding temperature, a tinned steel strip or
brass strip with a size of approximately 10 mm× 75 mm× 0.5 mm is welded straight to
the silver coating surface, ensuring that the weld length is approximately 15 mm. The
solder contains about 60 % tin, 38 % lead, and 2 % silver. It shall use non-corrosive
rosin-based flux. The coating shall not blister during welding. Then apply a force at
right angles to the sample and sufficient to pull the strip apart. Use a low-power
microscope to check whether the sample has peeling of coating. The sample shall not
have peeling of coating, and the failure shall only occur in the solder strip layer.
4.4 Bending test
It shall operate according to the bending test method specified in GB/T 5270.
Place the sample in a bending test device with a radius of curvature of 4 mm (or in the
jaws of a vise), bend the sample 90°, and then bend it back to its original shape, repeat
3 times. Use a low-power microscope to check whether the coating has peeling. The
sample shall be able to withstand 3 bends without peeling of coating. If the coating does
not peel, coating failure caused by microscopic or macroscopic cracking of the substrate
shall not be a reason for rejection.
4.5 Thermal shock test
It shall operate according to the thermal shock test method specified in GB/T 5270.
Place the sample in an oven at 200 ℃ ~ 300 ℃ and heat for about 30 min, then soak
and quench in water at room temperature. Use a low-power microscope to check
whether the coating has blistering or peeling. The coating shall not have blistering or
peeling.
4.6 Nano scratch test
4.6.1 General
This test method is suitable for evaluating the adhesion of sputtered silver coatings with
a thickness of 0.5 μm ~ 1.5 μm on steel or copper substrates. The results refer to
qualitative tests only. This test method may damage the substrate.
4.6.2 Scratch test equipment
It is recommended to use a sphero-conical diamond indenter with a radius of 2 μm for
nano scratch test.
Among them, the instantaneous curvature radius R(h) of the sphere top corresponding
to any indentation depth h measured by the sphero-conical diamond indenter from the
f) test load and loading rate;
g) adhesion.
NOTE. The scratching speed is the relative movement speed of the indenter and the coating, which
is determined by the test load, loading rate, and scratch length.
5 Test report
The purchaser shall provide the following information in the contract or order.
a) serial number GB/T 45345 of this document;
b) the nature, surface state, and type of finishing of the base metal (when these
factors may affect the performance and/or appearance of the coating);
c) the required surface roughness, preferably the purchaser provides samples that
meet the surface roughness requirements;
d) requirements for thickness and adhesion tests;
e) any special requirements for the base coating;
f) electrical properties and test methods of the coating;
g) if density correction is required for thickness calculation, provide the density of
the silver coating.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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