Phosphating · Process-engineered chemistry

UNI-IRON PHOSPHATEIron Phosphate

Most Economical Phosphating with Minimal Sludge

0.3–1.0 g/m²45–65°CLow Sludge3–5 Stage

01 / Product brief

Most Economical Phosphating with Minimal Sludge

Low-temperature iron phosphating chemistry producing a thin amorphous conversion layer of 0.3–1.0 g/m² on ferrous and galvanised substrates at 45–65°C. Iridescent or grey-blue coating improves paint adhesion with moderate pre-paint corrosion protection in a compact 3–5 stage process.

Low operating cost and minimal sludge generation — the most economical phosphating option for high-volume light engineering where zinc system sludge management is not viable. Ideal for lines without heavy corrosion performance requirements.

02 / Performance

Key process advantages

Product-specific outcomes for production quality, operating control and line performance.

010.3–1.0 g/m²

Lowest operating cost

Most economical phosphating option per unit area

0245–65°C

Minimal sludge generation

Reduces waste handling and disposal costs

03Low Sludge

Compact 3–5 stage process

Streamlined line for high-volume light engineering

03 / Technical data

Recommended operating window

Final operating conditions should be validated against substrate condition, line configuration and the specified finishing system.

[FePO₄ · AMORPHOUS · 45–65°C]

Steel · Galvanised Substrates · Light Fabrications

ParameterRecommended value
Operating Temp45–65°C
Coating Weight0.3–1.0 g/m²
pH Range2.0–2.5
Process Stages3–5

Values are typical guidance. MacroCoats process engineers establish the final bath specification after line trials.

04 / Process position

Where it works in the line

Applied at Stage 5 (Phosphate) in a 3–5 stage pre-treatment flow — ideal for paint adhesion on light engineering parts.

  1. 01

    Degrease

    Process stage

  2. 02

    Rinse

    Process stage

  3. 03

    De-rust

    Process stage

  4. 04

    Rinse

    Process stage

  5. 05

    Condition

    Process stage

  6. 06

    Phosphate

    Applied at Stage 5 (Phosphate) in a 3–5 stage pre-treatment flow — ideal for paint adhesion on light engineering parts.

  7. 07

    Passivate

    Process stage

  8. 08

    Rinse

    Process stage

  9. 09

    Dry

    Process stage

05 / Applications

Specified for real production demands

Typical applications and substrate conditions for UNI-IRON PHOSPHATE.

Application 01

Household appliances before powder coat

  • Steel
Application 02

Light fabricated steel furniture and shelving

  • Galvanised Substrates
Application 03

Agricultural implements and hand tools

  • Light Fabrications
Application 04

Steel doors, window profiles, and frames

  • Steel
Application 05

Light engineering stampings before liquid paint

  • Galvanised Substrates

Technical support

Validate UNI-IRON PHOSPHATE on your line.

Share your substrate, current bath, throughput and finishing system. Our process team will recommend a practical trial window.

Get in Touch

Let's optimise your surface treatment process.

Whether you're scaling a phosphating line, addressing inconsistency across plants, or moving to chromium-free systems — our team is ready to engineer chemistry around your process.