Phorgotten Phenomena

Review of Applicable Indices for Evaluation of Water Quality

This article compares three water quality indices for the evaluation of water to be used in industrial processes in Iran. They include the Puckorious Saturation Index, Langelier Saturation Index, and Ryznar Stability Index. The most applicable index for use in that country is suggested.

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.

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.

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.

Odd Occurrences During Cathodic Protection Troubleshooting

“Stop, Look, and Listen.” These words from railroad crossing signs are good ones to keep in mind when troubleshooting cathodic protection (CP). Some trouble shooting efforts are pretty straightforward, involving depleted anodes, broken wires, burned out rectifier stacks, and the like. But there are occasions when nothing seems to make sense, and then it’s time to “stop, look, and listen” and figure it out. Here are a few experiences from nearly 45 years of CP work.

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.

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.

The Strange Case of the Intermittent Condition

Being a cathodic protection corrosionist is a lot like being a detective. It is necessary to examine all the evidence when solving a mystery. Sometimes it is necessary to establish a stakeout. That’s what was done to find the source of intermittent shorts in this incident. Careful use of instrumentation, data analysis, and observation solved the problem.

Lead Contamination of Condensed Water

This article presents experimental data that show the solubility of lead in different waters. Specifically noted is the solubility of lead in condensed, or “pure,” water. It provides introductory information to those just entering the field of water corrosion and contamination as well as basic information to others not familiar with water corrosion and contamination.

Corrosion of Old Whaling Station Processing Equipment in Antarctica

The author visited Antarctica in January 2006. He came across several metal artifacts that had been there since early in the 20th century. Corrosion is not a serious problem in Antarctica’s environment, as evidenced by the relatively good condition of the artifacts.

It’s Not Just Paint—A Qualified Inspector Is Still Needed

The purpose of this article is to draw some attention to the importance of surface preparation and coating inspection and perhaps change some attitudes and the all-too-common practice of assigning less than qualified and experienced personnel to inspect surface preparation and coatings.

Recoating a Symbol of a City

The “Spoonbridge and Cherry” is an iconic sculpture in Minneapolis, Minnesota. Recently, concern was expressed over the condition of the cherry and its coatings. The cherry was inspected, removed, and recoated. This article describes the rehabilitation process and the materials used.