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EN-Rev IM/GN-EN/1.0 Copyright © January, 2023. CSI Solar Co., Ltd.
Process specifications for the different components must
comply with relevant international anti-corrosion standards.
All general requirements listed in the Canadian Solar
manual should be applied when installing “special-anti-
corrosion” modules.
C.2.2: SPECIAL ANTI-CORROSION METHODS FOR
MOUNTING
Use mounting components that contain the same metals or
metals with a similar electrochemical potential. The metal’s
coating also should be taken into account. There may be a
big difference between the electrochemical potentials of
two different coating materials.
If mounting components consist of two metals with a big
difference in electrochemical potential, please add
insulating washers (e.g. bi-metallic washers or insulation
gaskets) to isolate the metals from each other.
Copper/aluminum bi-metallic washers are commonly
available to prevent electrochemical corrosion. These
washers are made in a process called explosion welding.
Concerning insulation gaskets, we recommend mica
laminate, or other silicone or fluoride-based insulating
materials.
C.2.3: ANTI-CORROSION METHOS FOR GROUNDING
We recommend two special anti-corrosion methods for protecting the system’s grounding devices. Please refer to the
instructions in the table below:
Item
Method A
Method B
Coating
components
Fluorocarbon varnish
(one layer)
Layer 1 (metal side): epoxy zinc rich primer
Layer 2 (middle layer): fluorocarbon finish paint
Layer 3 (air side): fluorocarbon varnish
Coating
thickness
40 µm
Layer 1 (metal side): 40 µm
Layer 2 (middle layer): 40 µm
Layer 3 (air side): 40 µm
Painting interval
/
Follow the supplier’s general requirements when painting the three
coating layers. Apply the middle layer 24 hours after painting layer 1.
Paint the air side layer 6 hours later after painting the middle layer.
General
requirements
Clean the grounding components and make sure that they are dry and clean. The coating must cover
all the grounding components and junction areas of the module frame or mounting system. Please
refer to the figure below for more details.
