Zinc Primers

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Zinc Primers Jotun
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Agenda

• Corrosion
• Corrosion protection with Zinc
• Technology
• Zinc epoxy versus Zinc silicate
• Zinc confusions
• Zinc content in Jotun zinc primers
• Barrier and Resist projects

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Corrosion

• Corrosion is a reaction between
• Material
• and
• Surrounding environment
• .under formation of corrosion products

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Production and degradation of steel
Reaction between the material and the
surrounding environment takes place
The presence of Water / Humidity and Oxygen is a
prerequisite for corrosion of steel
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Manufacturing / refining - brings the material
to a higher energy level

• The resistance against oxidation (corrosion)
  varies for different materials
• When brought in contact with an electrolyte
  (aqueous solution that conducts electricity) some
  metals easily dissolve into ions. These are
  called Base metals
• Noble metals have a very strong resistance
  against corrosion and do not react to form ions
  unless exposed to very aggressive chemicals

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Corrosion / degradation- brings the material
"back" to the stable situation

• Corrosiveness in an environment increases or
  varies with
• Temperature
• Salinity
• Oxygen content
• Water velocity
• Acidity
• Type of electrolyte
• Content of contaminants / pollution that promotes
  corrosion
• Micro-organisms

Oxidation of metals is a natural process
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Still the best ..

• Zinc containing primers are still the best
  foundation for a long lasting advanced paint
  system
• Cathodic protection
• Self repairing
• Reducing risk of undercutting corrosion

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The ability of providing cathodic protection
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Technologies

• Shopprimers
• Preliminary corrosion protection
• Welding and burning properties
• Compatible with advanced paint systems
• Zinc epoxy primers
• Epoxy binder
• Primer on UHPWJ and blast cleaned steel
• Corrosion protection
• Primer in advanced paint systems
• Zinc silicate primers
• Silicate binder
• Primer on blast cleaned steel
• Corrosion protection
• Primer in advanced paint systems

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Technologies zinc shopprimers

• Binders
• Ethyl silicate
• Alkali silicate (water borne)
• Zinc content
• Low
• Medium
• Preliminary corrosion protection
• 6 14 months
• Welding and burning properties
• products tailored to productivity
• Compatible with advanced paint systems

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Zinc shopprimers
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Technologies - zinc primers

• The classification of zinc-rich primers refers to
  the binder
• Two different binders
• Silicate inorganic (solvent borne and water
  borne)
• Epoxy organic (solvent borne and water borne)
• In general the inorganic binders have better
  electrical conductivity than the organic binders
  and will give a metallic conductivity all through
  the coating
• Industry guidelines for minimum zinc requirements
  is given by organisations and specifications

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Zinc silicates and zinc epoxies(Resist 86 and
Barrier)

• Observations after maintenance work done under
  severe and difficult conditions in the Ekofisk
  field, North Sea Environments

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Barrier vinyl system
Resist 86 vinyl system
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9 years after last maintenance Barrier vinyl
system
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9 years after last maintenance Resist 86 vinyl
system
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9 years after last maintenance Barrier vinyl
system
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9 years after last maintenance Resist 86 vinyl
system
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9 years after last maintenance Barrier vinyl
system
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9 years after last maintenance Resist 86 vinyl
system
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Chemistry - zinc primers

• Inorganic Network of zinc, oxygen and silicon
  atoms chemically bonded to each other and to the
  steel substrate
• Organic Metallic zinc particles "floating"
  in a cured epoxy binder network. The high
  content of zinc ensures metallic contact between
  the zinc and the steel substrate, and between the
  individual zinc particles.

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Properties - zinc epoxy
Advantages
Considerations

• Chemically curing
• Good corrosion protection
• Good adhesion
• Pre-treatment UHPWJ to WJ2 or Sa 2½
• Good mechanical strength
• May be recoated with all types of paint, except
  alkyd
• Dry heat resistant up to 120ºC
• Short over-coating time

• Temperature dependent
• 2-component (water borne 3-comp)
• Film thickness 25 - 90 ?m
• Not acid- and alkaline resistant
• (Resistant between pH 6-10)

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Where to use - zinc epoxy primers

• Ships
• Offshore
• Industry
• New constructions / Maintenance
• Exterior and interior, above and below water (as
  holding primer for underwater use 20-30 microns)
• Blast cleaning to UHPWJ WJ2 or Sa 2½

Segments Objects Surface preparation
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Properties - zinc silicate primers
Advantages
Considerations

• Very good corrosion protection
• Very good solvent resistance
• Very high heath resistance
• (max 400oC)
• Very high mechanical strength
• Very good adhesion to blast cleaned steel
• Relatively good recoatability
• May be recoated with all types of paint, except
  Alkyd

• Requires humidity for curing
• 2-pack
• Max. DFT 100 µm
• (alkalisilicate 200 µm )
• At higher DFT tendency of mud-cracking or
  checking
• Curing to be checked before over-coating (ASTM
  4752)
• Use a tie coat or mist-coat/full-coat technique
  for the first subsequent coat
• Shelf life 6 months at 23ºC (alkali silicate 18
  24 months)

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Where to use - zinc silicate primers
Segments Objects Surface preparation

• Ships
• Offshore
• Industry
• New constructions / (maintenance)
• Exterior above the waterline
• Tank coating and water ballast tank
• Blast cleaning to minimum Sa 2½

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Jotun zinc primers
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Zinc - confusions.
? Total zinc is the sum of all the zinc compounds
in the formulation including Zinc dust, zinc
oxide, zinc phosphate etc.
Zinc dust 100
- The raw material consists of
Other components like lead and other impurities
1.5
Zinc 98.5
Metallic zinc 94
Zinc oxide 4.5
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SSPC - Paint 20

• Zinc rich Inorganic and Organic
• Zinc dust content
• Level 1
• Zinc dust ? 85 weight in dry film
• Level 2
• Zinc dust ? 77, lt 85 weight in dry film
• Level 3
• Zinc dust ? 65, lt 77 weight in dry film
• Zinc dust quality according to ASTM D 520

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ISO 12944 (and Norsok)

• Zinc dust content
• Zinc dust ? 80 weight in dry film
• Zinc dust quality according to ISO 3549

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ASTM D 520 - levels for lead content

• Defines type of zinc dust for pigmentation of
  coatings
• Type I
• No max. level of lead content
• Type II
• High purity grade, max. 0,01 lead content by
  weight
• Type III
• Highest purity grade, max. 0,002 lead content by
  weight

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Zinc in our epoxy primers
In addition to the zinc dust, 6 zinc oxide is
added, giving Barrier a total zinc content of 86
Standard specification for zinc in Jotun products
is 0.1 lead content Barrier, Barrier 77,
Barrier 90 can be supplied with ASTM D520 Type II
zinc dust
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Zinc in our silicate primers
Standard specification for zinc in Jotun products
is 0.1 lead content All Resist products can
be supplied with ASTM D520 Type II zinc dust
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Barrier in projects
Tianjin port, China 12 units of RMG
Ivana B platform, one of several installations
with Barrier on the Ivana field in The Adriatic
Sea
Kola Bridge, Russia
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Resist in projects
3x660 MW power complex BARH STPP in India
Guangzhou New International airport, China
Essar Oil Refinery at Vadinar in Gujarat, India
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• Jotun
• Zinc Primers
• Protects Properties