Mitsubishi Canter (FE, FG). Manual - part 17

 

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Mitsubishi Canter (FE, FG). Manual - part 17

 

 

68

5 Damage prevention 

5.6 Corrosion protection measures

MITSUBISHI FUSO body/equipment mounting directives for FE, FG  Issue date: 06. 07. 2012

!

 Only print out complete sections from the current version

i

Disassembly of components

If the body manufacturer makes structural 
modifications to the chassis, the corrosion protection 
in the affected areas must be restored to match the 
production standards of MITSUBISHI FUSO. The areas 
must also be finished with appropriate paintwork. 
Information on approved MITSUBISHI FUSO 
refinishing paint suppliers is available on request from 
the responsible department 

컄 page 15.

Damage to components

If components are damaged during disassembly 
(scratches, scuff marks), they must be professionally 
repaired. This applies especially for drilled holes and 
openings. Two-component epoxy primers are 
particularly suitable for repair work. 

Cutting of components

When cutting and grinding work is carried out, the 
adjacent painted components must be protected 
against flying sparks and shavings. Grinding dust and 
shavings must be carefully removed because these 
contaminants can spread corrosion. Edges and drilled 
holes must be cleanly deburred in order to guarantee 
optimum corrosion protection.

Corrosion protection on reinforcements and 
fittings

Reinforcements and fittings must receive adequate 
anti-corrosion priming prior to installation. In addition 
to galvanizing, cataphoretic dip-priming and zinc-rich 
paint in sufficient coatings have proved satisfactory 
for this purpose.

69

5 Damage prevention 

5.7 Corrosion prevention in welding work

MITSUBISHI FUSO body/equipment mounting directives for FE, FG  Issue date: 06. 07. 2012

!

 Only print out complete sections from the current version

i

5.7 Corrosion prevention in welding work

In order to avoid crevice corrosion at weld seams, the 
welds should be made in accordance with the 
examples shown.

Preparation

The welding area must be free from corrosion, grease, 
dirt or similar contamination. If painted surfaces are to 
be welded, the paint coat must first be removed by 
grinding or chemical stripping. If this is not done, the 
paint will burn and the residues can impair corrosion 
resistance.

After welding work

• Remove drilling shavings.
• Deburr sharp edges.
• Remove any burned paint and thoroughly prepare 

surfaces for painting.

• Prime and paint all unprotected parts.
• Preserve cavities with wax preservative.
• Carry out corrosion protection measures on the 

underbody and frame parts.

i

Plug and slot welds, particularly on horizontal 
surfaces, should be avoided due to the risk of 
corrosion. If they are unavoidable, these welds 
must receive additional preservation. Furthermore, 
avoid designs which allow moisture to accumulate. 
These must be fitted with additional drainage holes 
or gaps in the weld seam.

A

B

Example: Weld seams

A – Suitable
B – Unsuitable

70

5 Damage prevention 

5.8 Bolted connections

MITSUBISHI FUSO body/equipment mounting directives for FE, FG  Issue date: 06. 07. 2012

!

 Only print out complete sections from the current version

i

5.8 Bolted connections

Finish-painted components

If painted parts are to be bolted together, the coats of 
paint must not cause settling in the bolted 
connections. In such cases, hard, high-density 
coatings such as cataphoretic immersion primers or 
powder coatings should be used. The coat thicknesses 
should be kept as small as possible (cataphoretic 
immersion primer approx. 20 µm (66 µft), powder 
coatings approx. 100 µm (330 µft)). 

• If using bolts with serrations under the head, an 

additional top coat must be applied to touch up any 
paint damage.

• The use of hexagon socket or Torx socket bolts 

with the bolt heads in a horizontal position is to be 
avoided, as moisture can accumulate in the bolt 
head under certain conditions, leading to 
corrosion.

Fasteners

In areas susceptible to corrosion always use bolts, 
nuts, etc. with corrosion resistance (>480 h saline fog 
test according to ISO 9227) regardless of the required 
strength class. This standard is satisfied, e.g. by bolts 
with electroplating and additional thick-coat sealing 
and zinc platelet coatings with sealer (e.g. Dacromet 
or Deltaseal).

Information on identifying suitable coatings can be 
obtained from your local bolt supplier.

For details on bolted connections see Section 3 
컄 page 27.

71

5 Damage prevention 

5.8 Bolted connections

MITSUBISHI FUSO body/equipment mounting directives for FE, FG  Issue date: 06. 07. 2012

!

 Only print out complete sections from the current version

i

Preventing contact corrosion

Direct contact between materials with different 
electrode potentials can lead to corrosion of the less 
noble material when exposed to moisture and salt 
ions.

When selecting materials, avoid the following 
combinations:

• Chrome/nickel-steel with aluminium
• Chrome/nickel-steel with zinc-coated steel

Insulation by coating

Contact corrosion can be prevented by using 
insulation such as washers, sleeves or bushings. Even 
in this case, however, the connecting points must not 
be persistently exposed to moisture.

Vehicle cleaning and care

When the vehicle is handed over to the body 
manufacturer, it must immediately be cleaned of salt 
and dirt. If it is to be stored for some time, the vehicle 
must be preserved.

During modification it must be ensured that load-
bearing components are additionally protected 
against aggressive chemicals and environmental 
influences. If the vehicle comes into contact with 
chemicals or salts (e.g. snow-clearing operations), it 
must be cleaned thoroughly at regular intervals.

2

2

1

1

1

Insulating  washer

2

Insulating  sleeve

!

A conductive connection occurs if two different 
metals are brought into contact with each other 
through an electrolyte (e.g. air humidity). This 
causes electrochemical corrosion and the less base 
of the two metals is damaged. The further apart the 
two metals are in the electrochemical potential 
series, the more intense electrochemical corrosion 
becomes.

For this reason, electrochemical corrosion must be 
prevented by insulation or by treating the 
components accordingly, or it can be minimized by 
selecting suitable materials.

 

 

 

 

 

 

 

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