Canadian Finishing & Coatings Manufacturing - Sept/Oct '23 - 15

INDUSTRIAL FINISHING: CORROSION INHIBITORS
PRIME TIME
Co-blending phosphate inhibitors for sustainable, low-cost corrosion control
BY ELLA NEWINGTON
s professionals working within the coatings
industry, we are all acutely aware of the issues that
corrosion poses and want to provide our customers
and end-users with the best quality products to
tackle this $2.2-trillion global issue. Anti-corrosion coatings
have become a necessity for industries to safeguard the huge
investments they make in terms of money, property and safety
of workers. Whether coating to protect pipelines, aeroplanes
or computer gadgets-customers are united in their battle
against corrosion.
Historically, some of the most effective corrosion
inhibitors have been based on chromium. However, these
chemistries are currently being phased out globally leaving a
gap in the market for a highly effective inhibitor that is nontoxic
and non-carcinogenic.
Following strong R&D efforts and lengthy extended
testing, many coatings companies have turned to phosphatebased
systems. But there is a step-change primer alternative
that can save 10-30 per cent on the cost of anti-corrosives
A
as well as offering customers more sustainable coatings that
require no hazard warning label.
Why are phosphates popular?
Currently, 45 per cent of the corrosion inhibitor market is
dominated by phosphates.
Industry testing and academic research show that adding
zinc phosphate can inhibit the anode process of metal
corrosion and consequently prevent the horizontal diffusion
of the corrosive medium into the coating/metal interface
and slow down the disbonding of the coating.
Additionally, phosphates don't pose the same health
and environmental hazards as chromates. However, they
do still present environmental issues through leaching.
In their form as inhibitors they are classed as a Category
1 Environmental Hazard. Within the coatings system, at
loadings of 2.5 per cent and above, the paint will be classed
as a Category 2 Environmental Hazard so will still require
hazard labelling.
September/October 2023
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Canadian Finishing & Coatings Manufacturing - Sept/Oct '23

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