When checking zincs in a saltwater cooled heat exchanger, you should __________.

Correct Answer: Option A — replace the zincs if they are approximately 50% consumed

Sacrificial anodes, or zincs, protect heat exchanger components from galvanic corrosion by being the preferred path for electron flow. Once a zinc is approximately 50% consumed, its surface area decreases, reducing its effectiveness. Industry best practice and preventive maintenance schedules dictate replacement at this stage to ensure continued cathodic protection.