Toyota HULUX 2020 Body Section Manual page 22

Elements and standard characteristics
Symbol Name
K Potassium
Ca Calcium
Na Sodium
Mg Magnesium
Al Aluminum
Zn Zinc
Fe Iron
Ni Nickel
Sn Tin
Pb Lead
H Hydrogen
Cu Copper
Hg Mercury
Ag Silver
Pt Platinum
NOTICE:
Examples of galvanic corrosion and solutions
Select materials to minimize ionization tendency differences between metals
Parts
Aluminum panel and
Dacrotized bolts
Stainless steel panel and
Dacrotized bolts
Stainless steel panel and
zinc-plated plate
Stainless steel part and
aluminum part
【2】-7. Rust prevention
Ionization
Corrosion
tendency
Corrodes easily
due to ionization
↑
Large
↑
Iron
Ionization
tendency
↓
↓
Small
Does not corrode
easily due to
ionization
Symptom
Aluminum panel
Change Dacrotized bolts to zinc-plated bolts
rusting
Dacrotized bolt
Change Dacrotized bolt to stainless steel bolt
rusting
Zinc-plated plate Change zinc-plated plate to stainless steel
rusting plate
Aluminum part
Change aluminum part to stainless steel
rusting
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Reaction to water Reacts to air
Reacts at normal
temperatures
Oxidizes easily
Reactions to
steam, high-
temperature
water
Oxidizes slowly
Hydrogen
Does not react
Does not oxidize
Solution
easily