What characterizes active pitting in boiler corrosion?

Study for the Massachusetts 3rd Class Engineer Exam. Access flashcards and multiple choice questions with hints and explanations. Prepare for success on your exam!

Active pitting in boiler corrosion is characterized by the presence of a reddish-brown tubercle that indicates ongoing corrosion. This type of corrosion involves localized areas where the protective oxide layer on the metal has been compromised, allowing moisture and corrosive agents to penetrate and create pits. The reddish-brown color typically results from rust formation as iron oxide develops, indicating that the metal is actively corroding in that area.

The formation of these tubercles is a sign that corrosion is occurring beneath the surface, which can lead to significant damage if not addressed. The presence of an active tubercle highlights the need for immediate inspection and treatment to prevent further degradation of the material, which is critical in maintaining the integrity and safety of the boiler system. This ongoing corrosion is distinct from states where there may be inactive or stabilized conditions, such as other options that describe smooth surfaces or different aspects of corrosion not actively occurring.

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