Phosphate Conversion Coatings

Cor-Pro Systems, Inc. provides top-of-the-line phosphate conversion coating services in Houston, Texas and nearby Gulf Coast areas.

coating services for equipments

With almost 30 years of expertise in corrosion protection, Cor-Pro Systems delivers phosphate conversion coating services that aid in superior long-term corrosion protection. Cor-Pro is a high quality provider in the corrosion prevention industry in the Gulf Coast, accessible to nearby facilities like oil refineries and petrochemical plants.

Phosphate conversion is a chemical process extensively used on iron, steel, and zinc parts and equipment. Phosphate conversion coatings are a crucial ingredient in the surface preparation stage due to its strong corrosion inhibiting properties, lubricant absorption, and wear resistance.

If you have questions regarding coatings or want to get a custom quote for your phosphate conversion coating needs, call Cor-Pro in Houston, Texas (Gulf Coast) at 713-896-1091, or send an e-mail to


Corrosion Protection: What Are Phosphate Conversion Coatings?

Phosphate conversion or phosphating is the chemical and electro-chemical process of creating a layer of crystalline phosphates during the surface preparation stage of steel.

Phosphate conversion coatings are typically formed with zinc, iron, or magnesium phosphate salts that are dissolved in phosphoric acid. When the coating is applied or immersed to steel, the chemical reaction depletes the hydronium ions, raises the pH, and causes the dissolved salt to fall out of the solution and precipitate on the surface.

The chemical process creates a porous, absorbent layer that is often considered as a primer coating or conversion layer for subsequent oil, paint, and other protective coatings and sealers. Phosphate conversion coatings are typically used as a pretreatment to a supplementing corrosion protection method, rather than used on its own.

Corrosion Protection Coatings: Types Of Phosphate Conversion Coatings

Phosphate conversion coatings can be formulated a number of ways depending on the substrate material’s requirements and environment.

The most common formulation is zinc phosphate coatings which are heavily used in industrial settings, but iron and magnesium phosphate coatings are also available. All types of phosphate conversion coatings exhibit superior corrosion protection.

Zinc phosphates are commonly used for rust proofing and anti-galling of steel. The coating can be applied by spray or by immersion.

Magnesium phosphates are commonly used for lubricity and wear resistance. The coating is applied by immersion of the substrate in a magnesium phosphate bath.

Iron phosphates are commonly used to enhance adhesion of paint or powder coatings. The coating can be applied by spray or by immersion.

Corrosion Protection: Why Are Coatings Important?

Companies can save up to 25 to 30% of annual corrosion costs in the US if they invest in quality coatings. Without proper coatings, corrosion can have damaging effects on valves, motors, pumps, fasteners, switches, belts, and other mechanical equipment.

In infrastructure, the annual direct cost is around $22.6 billion. Corrosion costs total $47.9 billion for utilities such as gas, water, and electricity.

Reduce costs

  • 25% of costs caused by corrosion is avoided by applying existing knowledge on corrosion protection such as coatings.

Reduce accidents

  • Work-related accidents cost the US $250 billion every year. A lot of those incidents are caused by faulty work equipment. If a structure is free of corrosion, the risk for accidents is significantly reduced.

Save time

  • In the event your equipment does falter due to corrosion, repairing it will take time. Once operations stop, the delay in production will also mean profit losses.

VELOCITY: Delivery in Hours, Not Days

Cor-Pro’s Velocity coating service is specifically geared toward rapid-response tasks.

If you have a pressing deadline, Velocity is the answer to your prayers. This premium service utilizes every advantage of the Cor-Pro methodology, including multiple accuracy checks, superbly trained crew, and round-the-clock facility operation to meet delivery schedules.

We take pride in the Cor-Pro Velocity Service. The purpose and responsibility of this offering is to ensure that your urgent coating projects are processed and delivered expeditiously. We have assembled a team of Cor-Pro’s best experts to staff the Velocity Desk everyday at 11:00 AM and 2:00 PM to process any project that require Velocity Service.

Only Cor-Pro can offer you this kind of responsiveness while guaranteeing a superior level of professionalism and commitment to quality.

For a custom consultation or a quote, call Cor-Pro in Houston, Texas (Gulf Coast) at 713-896-1091, or send an e-mail to