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.
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.
Graphitization is a corrosion phenomenon
associated with grey
cast iron. This material consists
essentially of flakes of graphite in
an iron matrix. The iron constituent corrodes
out because of the same multitude of
corrosion reactions that affect ferrous metals,
leaving behind the graphite and some
corrosion products.
Cathodic protection expert John Fitzgerald uses an
experience early in his career to illustrate the
consequences of not heeding the advice of corrosion
professionals when designing and implementing
corrosion control systems—many times because of
reluctance to bear the expense. Cutting corners to
save money up front can lead to unexpected failures
and expensive repair and replacement in the future.
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.
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.
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.
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.
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.
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.
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.
There are times when it is necessary to use impressed
current cathodic protection (ICCP) in urban areas,
in spite of concerns about extensive interference. This
article describes three ICCP systems that can be used
safely in urban environments. They are distributed
anode (parallel) groundbeds, deep anode
groundbeds, and low-output surface groundbeds.
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.
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.