Click on the alphabetic index to display terms beginning with the corresponding letter or search for a term below.


A reduction of the anodic reaction rate of an electrode involved in corrosion.


A state of a metal in which a surface reaction product causes a marked corrosion rate to that in the absence of the product.


Process where steel coils are cleaned using hydrochloric baths to remove impurities such as rust, dirt, and oil.

Pig Iron

Melted iron produced in a blast furnace that contains at least 1.5% carbon. Named long ago when molten iron was poured through a trench in the ground to flow into shallow earthen holes, the arrangement looked like newborn pigs suckling. The central channel became known as the "sow," and the moulds were "pigs."

Piling (Sheet Piling)

A structural steel product with interlocking edges generally used in cofferdams and riverbank reinforcement.


Term that originally defined a tube used to transport fluids or gases. Now, pipe and tube are used interchangeably.


Localized corrosion (in the form of pits) of a metal surface that is confined to a small area.

Pitting factor

The ratio of the depth of the deepest pit resulting from corrosion divided by the average penetration as calculated from mass loss.


Sheet steel measuring more than eight inches wide with a thickness ranging from one quarter of an inch to more than one foot.

Postweld heat treatment

Heating and cooling a weldment in such a way as to obtain desired properties.

Powder Metals

Fabricating technique where fine metallic powder is compacted and heated under high pressure to solidify the material.

Precipitation Hardening (PH)

A small category of steels resembling martenistic steels that have great strength and hardness due to heat treatment.


Steel that is chemically treated to prepare it for future surface treatments and to prevent corrosion prior to future alterations.

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