Coatings & Linings

Lining Prevents Biogenic Sulfide Corrosion In Wastewater Systems

Faced with serious concrete deterioration from biogenic sulfide corrosion within collection systems, engineers and municipalities are extending the service life of wastewater conveyance structures with the use of 100% solids polyamine systems designed for hydrogen sulfide (H2S) permeation resistance. This article explains how sewer interceptors, manholes, and lift stations were protected using fluid-applied linings.

Painting at Night in the Gulf of Mexico

The heliport on a very large offshore structure required complete coating removal and replacement. The work could not be performed during daylight hours because of a very busy and crucial flight schedule, as well as safety concerns for the workers from paint debris and metal loss. This article describes the methods and materials used to perform the work during nighttime hours. The job was successfully completed in two weeks.

Managing a Coating & Plating Supply Chain

Re-engineering supply chains can reduce costs, cut delivery times, provide a significant competitive advantage, and enhance customer relationships. Supply chain concepts can be applied to the finishing phase (coating or plating) of production to further cut costs and delivery times.

Advanced Coatings for Water Treatment Plant Components

Components of water treatment plants (WTPs) are susceptible to corrosion from constant immersion in water and proximity to chlorine. A case history of corrosion problems and their treatment at an Army WTP is presented. Solutions included using high micro-silica restoration mortar and advanced coal tar epoxy coatings.

Amine Blush in Epoxy Coatings

Carbonated amine material, often called amine blush, is the reaction product of the amine functional curatives in epoxy paint with carbon dioxide (CO2) and water vapor. This article explains the formation of amine blush and discusses factors controlled by the applicator and those controlled by the paint manufacturer.

Surface Preparation

Proper surface preparation is an essential preliminary step for any coating application. It is false economy to skimp on surface preparation in the belief that the coatings applied will compensate for surface deficiencies. This is especially true of high-performance coating materials.

Effective Rehabilitation Planning for a Natural Gas Transmission Line—Part 2

This article outlines the results of a long-term pipeline integrity plan that was used to rehabilitate large segments of a natural gas pipeline over the past eight years. Part 1 of this article discussed the details to be followed in an effective rehabilitation plan to accomplish the goal of a well-maintained pipeline system.

Catastrophic Oxidation of Stainless and Nickel Alloys

Molybdenum-bearing stainless steels and nickel alloys can experience catastrophic oxidation. This occurs during oxidation of molybdenum-bearing materials and is caused by the action of molybdenum trioxide (MoO3) as an oxidation catalyst. This article explains the oxidation phenomenon and suggests ways to prevent it.

Preventing Mechanical Damage Makes Good “Cents”!

An excellent coating job can be ruined by mechanical damage during shipping and installation of the coated piece. Coating repairs can be time-consuming, expensive, and may yield an inferior coating job. This article provides precautions to be taken to minimize coating damage subsequent to initial coating.

Effective Rehabilitation Planning for a Natural Gas Transmission Line—Part 1

This article describes the pipeline rehabilitation program developed by the natural gas transmission company in Colombia, South America. Part 1 presents the work accomplished to develop the Effective Rehabilitation Plan (ERP). Part 2 discusses the ERP in detail, including results and accomplishments.

Effects of Coating on Corrosion and Cathodic Protection

The four basic elements of a corrosion cell are an anode, a cathode, and the metallic and electrolytic pathways between them. Corrosion control can be achieved by eliminating (or reducing) any of these elements. One such method is to modify the electrolytic pathway by introducing a barrier between the threatened metal surface and the corrosive medium (i.e., by applying some kind of coating).

Coating of Faying Surfaces

This article discusses the challenges involved with coating contact, or “faying,” surfaces of steel building components that are bolted together. The use of certain zinc-rich primers is one successful solution, provided the primers meet required parameters for slip coefficient.

Predicting Coating Life

The prediction of coating life depends on many factors, including the coating system used, preparation and application methods, and the severity of the environment. This article describes the knowledge needed to estimate coating life and the conditions that can compromise coating systems.

Inorganic Zincs—How Do They Cure?

Inorganic zinc (IOZ) coatings are used pervasively in industry to provide reliable protection from corrosion on a variety of substrates. Problems have emerged with coatings applied over zinc primers, however, such as delamination and blistering. This article discusses proper curing methods for IOZs to ensure dependable performance of the entire coating system.