Heavy and prolonged seawater contamination of the fuel oil will form what type of corrosive products on the brickwork?

The formation of corrosive products on brickwork due to heavy and prolonged seawater contamination of fuel oil primarily leads to slag formation. When seawater contaminates fuel oil, it introduces contaminants such as salt and other minerals that can react with the combustion process and the materials of the combustion chamber, including the brickwork.

In this context, slag refers to the byproducts produced through the melting and combining of mineral impurities found in the fuel and salt from the seawater. This mixture can solidify, forming a hard, glassy substance that can adhere to the surfaces within the combustion area, leading to corrosion and degradation of the brickwork. This is particularly relevant in marine environments where saltwater exposure is common, making it essential for machinist mates to understand the effects of such contaminants on equipment and structural components.

Other choices such as rust formation typically relate to the oxidation of iron, cinder accumulation is a result of incomplete combustion and often hindered airflow, and acid buildup usually results from chemical reactions involving acid-forming compounds rather than direct saltwater contamination. These processes are not the primary concern when discussing the effects of seawater contamination in the context of fuel oil and brickwork.