The effect of coating propellers : the impact on the integrity of nickel aluminum bronze as a function of cathodic protection / Trisha Huber. : D68-2/154-2018E-PDF

"To investigate coatings-based methods for propeller biofouling mitigation, specimens of nickel aluminum bronze (NAB) were prepared by coating with either marine epoxy or copper ablative antifouling, and scored on each side, to expose the NAB. The specimens were immersed for 18 months in low flowing seawater, under either full or no cathodic protection. The specimens were assessed at 3, 6, 12, and 18 months; the assessment included the removal of a small cross section for microscopic examination. The integrity of the NAB at the crevices, due to the score lines, was monitored as a function of time. The coating condition was also monitored; the onset of copper conversion was noted by the 3 month mark with the protected antifouling coated specimens, and continued to increase with time. Furthermore, the electrodeposition of copper onto exposed NAB was also noted with protected antifouling specimens"--Abstract, p. i.

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