The purpose of corrosion-protection coating is not simply cheap application

Price is often the first consideration when evaluating corrosion-protection coating.

How much do the materials cost?
How much does application cost?
What is the unit price per 1 m²?
Is it cheaper than another supplier?
Does it fit the budget?

Price is, of course, important.
Factory equipment, structural steel, outdoor structures, tanks, support frames, and pipe supports in particular may have large coated areas and substantial initial costs.

However, judging corrosion-protection coating by initial price alone is risky.

Its purpose is not simply to apply a coating cheaply.

Its true purpose is to protect steel from corrosion and keep equipment or structures safe and usable for a long time.

Even with a low initial price, rust appearing after a few years creates repair costs.
Recoating adds scaffolding and downtime costs.
Progressive corrosion also creates safety or equipment-stoppage risks.

Corrosion-protection coating is a coating application that should be assessed by long-term maintenance costs rather than initial costs.

What is life-cycle cost?

Life-cycle cost considers the total cost over the entire service period, rather than only the cost of initial purchase and application.

For corrosion-protection coating, it includes costs such as the following.

• Initial coating costs
• Repair costs
• Recoating costs
• Scaffolding costs
• Protective covering costs
• Equipment downtime costs
• Inspection costs
• Response costs when defects occur
• Component replacement costs due to corrosion
• Safety measure costs
• Accident risks
• Production stoppage risks
• Effects on customer trust

A low-cost specification may appear advantageous when only initial coating costs are considered.

However, early corrosion and frequent repairs or recoating may make it expensive over the long term.

Conversely, a slightly higher initial cost may lower total costs if it extends recoating intervals, reduces repairs, and avoids downtime.

For corrosion-protection coating, examine how much will be spent over a period of years, rather than initial price alone.

Why low-cost coating specifications can become expensive

Choosing a low-cost specification can make corrosion-protection coating expensive long-term.

Examples include the following.

Reduce film thickness to lower initial costs.
Simplify the primer application.
Perform insufficient surface preparation.
Avoid a highly weather-resistant topcoat.
Omit on-site repairs.
Underestimate treatment of edges or cut sections.

These measures may reduce initial costs.

However, early corrosion creates the following costs.

• Rust removal
• Repair coating
• Recoating
• Scaffold installation
• Equipment stoppage
• Component replacement
• Safety measures
• Complaint handling

Later costs may exceed the amount initially saved.

Low price itself is not the problem.
The problem is a specification that is insufficient for the operating environment or required service life.

Consider recoating intervals

Recoating intervals are extremely important in corrosion-protection coating.

The interval is the period until the next major repair or recoating is required.

For example, one specification may require recoating after 3 years.
Another may last 7 years.
A more durable specification may last 10 years or longer.

This difference has a major effect on long-term costs.

Recoating involves the following costs as well as materials and application labor.

• Scaffolding
• Protective coverings
• Process and schedule coordination
• Equipment downtime
• Safety management
• Worker arrangements
• Effects on production plans

Factory and plant equipment may particularly need to be stopped for coating.

In such cases, downtime losses may exceed material costs.

Always check recoating intervals as well as initial costs when considering corrosion-protection coating.

Do not overlook scaffolding and equipment downtime costs

Recoating outdoor structures or equipment at height may require scaffolding.

Scaffolding costs may exceed material costs.

Work around equipment also requires safety measures and protective coverings.
For equipment inside a factory, consider effects on production lines and movement through the workplace.

If equipment must stop, that downtime is also a cost.

Examples of effects include the following.

• Production stoppage
• Shipment delays
• Workers waiting
• Effects on other processes
• Effects on customer delivery dates
• Emergency response costs

Initial-price-only decisions overlook these indirect costs.

Business owners and factory managers need to consider more than material costs.
They need to assess the effects of recoating or repairs on factory operations.

Corrosion creates safety risks

Corrosion of steel structures is more than an appearance defect.

As it progresses, it affects structural and equipment safety.

Risks include the following.

• Reduced structural steel strength
• Deformed support frames
• Damaged pipe supports
• Corroded bolts
• Leaks in tanks or equipment
• Falling components
• Operator safety risks
• Equipment stoppage
• Emergency repairs

These problems involve safety management, emergency response, operational stoppage, and loss of trust as well as repair costs.

Corrosion-protection coating is more than a surface finish.

It is a maintenance technology for continuing to use equipment or structures safely.

Its cost should therefore be considered as an investment in safety, rather than simply an expense.

The operating environment changes the required corrosion-protection specification

Specifications change with the operating environment.

Even for the same steel, indoor and outdoor use require different corrosion protection.
Coastal and inland use also differ.
Factory equipment exposed to chemicals or oil needs additional forms of resistance.

Check the following operating-environment factors.

• Indoor or outdoor use
• Rain exposure
• Ultraviolet exposure
• High humidity
• Coastal location
• Salt exposure
• Chemical or oil contact
• High temperatures
• Wear or impact
• Ease of access for repairs
• Difficulty of stopping equipment

Selecting materials without checking the environment creates either an excessive specification or insufficient performance.

An excessive specification raises costs unnecessarily.
Insufficient performance causes early corrosion.

Select a specification that sufficiently meets the environment’s needs without unnecessary excess.

Consider corrosion-protection coating as a system, not individual materials

Long-term corrosion protection must not be assessed through materials individually.

“This rust-inhibiting coating is strong.”
“This topcoat has high weather resistance.”
“This material is cheap.”

Such comparisons of individual products cannot accurately establish corrosion-protection performance.

Consider the following elements as a coating system.

• Surface preparation
• Primer
• Intermediate coat
• Topcoat
• Film thickness of each layer
• Recoating intervals between layers
• Drying and curing conditions
• On-site repairs
• Inspection intervals
• Recoating plan

For example, zinc-rich paint is effective as a corrosion-protection primer.
However, insufficient surface preparation prevents its performance from developing.

MIO coatings are effective as intermediate coats that improve barrier properties.
However, unsuitable thickness or recoating conditions prevent adequate performance.

The topcoat provides weather resistance.
However, poor compatibility with underlying layers or unsuitable application conditions prevents stable long-term performance.

Corrosion-protection coating is a system combining materials, processes, application, and management.

Omitting surface preparation increases long-term costs

Surface preparation is often targeted for cost reduction.

How thoroughly should rust or dirt be removed?
Should blasting be used?
How thorough should degreasing be?
Should salt contamination be checked?
How much old film should be removed?

These require labor and expenditure.

However, omitting them substantially reduces corrosion protection.

Residual rust, oil, salt, dust, or mill scale on steel prevents firm adhesion.
Corrosion may also progress beneath the film.

Early blistering, peeling, or rust then occurs.

Reducing initial costs by omitting preparation raises long-term costs if repeat repairs become necessary.

Do not underestimate surface preparation as merely preparatory work.
It is the foundation of corrosion-protection performance.

Neglected on-site repairs become starting points for corrosion

Steel structures may be coated in the factory, transported to the site, and assembled there.

The film can be damaged during this process.

Rubbing during transport.
Forklift contact.
Bolt fastening.
On-site cutting.
Drilling.
Welding.
Contact during assembly.

If these damaged or fabricated areas are left unrepaired, corrosion begins there.

On-site repair is extremely important for long-term corrosion protection.

However, it is also a process readily left to individual operators’ judgment.

Insufficient cleaning before repair.
Use of unspecified materials.
Insufficient thickness.
Failure to follow drying times.
An overly narrow repair area.
No inspection records.

Under these conditions, an area thought to be repaired may become a starting point for corrosion.

Treat on-site repairs as part of the coating specification.

Points to consider for corrosion-protection coating in Vietnam

Vietnam has many demanding conditions for corrosion-protection coating.

The following conditions require particular attention.

• High temperature and humidity
• The rainy season
• Coastal salt exposure
• Outdoor storage
• Humidity inside factories
• Transport damage
• Insufficient repairs at the installation site
• Dust
• Oil or chemicals
• Delayed inspections or repairs

Hot, humid environments make steel surfaces more prone to rust.
The rainy season makes moisture management before and after coating difficult.
Coastal salt exposure promotes corrosion.

Outdoor storage also increases corrosion risks through rain exposure or condensation.

In Vietnam, management must cover storage, transport, application, repairs, and inspections as well as material specifications.

Decision criteria for business owners and factory managers

Corrosion-protection coating should not be decided by purchasing departments alone.

Business owners and factory managers should also consider the following perspectives.

• For how many years will this equipment or structure be used?
• Will corrosion create safety risks?
• Will repairs require equipment stoppage?
• Will recoating require scaffolding?
• Will it be used in a coastal or high-humidity environment?
• How large would losses from early corrosion be?
• Should initial price or long-term maintenance costs take priority?
• Is there an inspection and repair system?
• Can accident risks caused by corrosion be accepted?

Corrosion-protection coating is more than a material-cost issue.
It is a management issue involving safety, maintenance, equipment operation, and customer trust.

CoatureVietnam’s 4M checkpoints

CoatureVietnam organizes corrosion-protection life-cycle costs from the 4M perspectives.

Material

• Does the material suit the operating environment?
• Is zinc-rich paint needed?
• Is a barrier layer such as an MIO coating needed?
• Does the topcoat have sufficient weather resistance?
• Are repair materials compatible with the main specification?
• Can the system handle salt or chemical exposure?
• Is it a manufacturer-recommended coating system?

Method

• Is surface preparation sufficient?
• Are film thickness standards clear?
• Are intervals between coats controlled?
• Are temperature and humidity checked during application?
• Are on-site repair procedures standardized?
• Are inspection intervals defined?
• Are there criteria for deciding when to recoat?

Machine

• Is blasting equipment available?
• Does the environment allow large components to be coated?
• Can the coating equipment apply high film thicknesses?
• Is drying and conditioning space sufficient?
• Are film thickness gauges available?
• Are equipment or tools available for on-site repairs?
• Are scaffolding or safety measures needed?

Man: People

• Do operators understand the purpose of corrosion-protection coating?
• Do they understand the importance of surface preparation?
• Do they understand that insufficient thickness leads to long-term corrosion?
• Do they understand the importance of on-site repairs?
• Do managers understand recoating intervals and maintenance costs?
• Are purchasing personnel judging by initial price alone?

From the Management perspective, control design life, maintenance plans, warranty conditions, budgets, responsibilities, inspection records, and repair history.

Questions to ask during customer visits

Sales and technical teams can use the following questions when discussing corrosion-protection coating.

• For how many years is this equipment or structure intended to be used?
• Will it be used outdoors or indoors?
• Will it be used in a coastal or high-humidity environment?
• Are there safety risks from corrosion?
• Will repairs require equipment stoppage?
• Have recoating intervals been defined?
• After how many years has rust appeared in the past?
• Does the location require scaffolding or protective coverings?
• Which surface preparation method is used?
• Are there thickness standards for each layer?
• Have on-site repair procedures been defined?
• Is the specification being chosen solely by initial price?
• Have long-term maintenance costs been compared?

These questions help identify long-term costs and safety risks the customer may have overlooked.

Conclusion: The value of corrosion-protection coating becomes clearer over the long term

Do not judge corrosion-protection coating by initial price alone.

Even a low-cost specification creates repair, recoating, scaffolding, and downtime costs if rust appears quickly.
Progressive corrosion also creates safety and production-stoppage risks.

Selecting a specification suited to the operating environment and controlling preparation, thickness, recoating, on-site repairs, and inspection intervals can extend recoating intervals and lower long-term maintenance costs.

Corrosion-protection coating is more than a material-cost issue.

It is an investment in extending equipment life, protecting safety, and controlling maintenance costs.

CoatureVietnam views corrosion-protection coating as an improvement proposal that protects the customer’s equipment and safety long-term, rather than simply material sales.

Coating the Future with Science and Care

To put this into practice, we propose an approach that includes recoating intervals, repair workload, safety risks, and life-cycle cost alongside initial price.