Corrosion Evaluation of a Navy MK50 Weapon Station Friction Brake Assembly

2020 ◽

Author(s):

Ruby Romsland ◽

Kenneth J. McDonald

Keyword(s):

Stainless Steel ◽

Large Scale ◽

Galvanic Corrosion ◽

The United States ◽

Electrochemical Polarization ◽

Polarization Measurements ◽

Corrosion Evaluation ◽

Stainless Steel Screw ◽

Unknown Composition ◽

Friction Brake

Abstract The presence of corrosion on or within structures is of major concern as corrosion reduces the integrity of the materials which could potentially result in large-scale failures of structures and equipment.1 The United States Navy is an organization that actively works to prevent large equipment failure due to corrosion. One such problem is the corrosion of the friction brake assembly on the MK50 Weapon Station, which has recently been experiencing corrosion between the friction brake and its set screw preventing it from operating correctly. The friction brake was known to be stainless steel; however, the set screw was of unknown composition. Through elemental analysis it was determined that the MK50 Weapons Station friction brake set screw was similar in composition to commonly available black oxide coated steel screws. Electrochemical polarization measurements of the friction brake assembly components revealed that the set screw and the friction brake were electrochemically dissimilar metals which resulted in the galvanic corrosion of the assembly when out at sea. The electrochemical polarization measurements of a stainless steel screw showed a corrosion potential similar to that of the friction brake; therefore, replacing the current set screw with a stainless steel screw would decrease the galvanic potential difference between the set screw and the friction brake. This proposed solution is expected to slow or prevent further corrosion of the MK50 Weapon Station ensuring the combat readiness of the equipment.

Download Full-text

CORROSION EVALUATION ON MILD STEEL IN DIFFERENT SELECTED MEDIA

International Journal of Engineering Applied Sciences and Technology ◽

10.33564/ijeast.2020.v05i03.006 ◽

2020 ◽

Vol 5 (3) ◽

pp. 33-38

Author(s):

Okuma SO ◽

Orhorhoro EK ◽

Tamuno RI

Keyword(s):

Mild Steel ◽

Corrosion Evaluation

Download Full-text

Corrosion Evaluation of Steel Structures exposed to Atmospheric Environments

The Journal of the Institute of Electrical Engineers of Japan ◽

10.1541/ieejjournal.137.161 ◽

2017 ◽

Vol 137 (3) ◽

pp. 161-165

Author(s):

Teruhisa TATSUOKA ◽

Masanori OSADA

Keyword(s):

Steel Structures ◽

Corrosion Evaluation

Download Full-text

The Corrosion Evaluation Methodology of the Lock Gate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.937.105 ◽

2014 ◽

Vol 937 ◽

pp. 105-108

Author(s):

Chao Hua Jiang ◽

Ke Fan ◽

Xiang Yun Luo ◽

Liang Qian

Keyword(s):

Coating Thickness ◽

Evaluation Methodology ◽

Corrosion Depth ◽

Corrosion Detection ◽

Surrounding Environment ◽

Corrosion Evaluation ◽

Rating Method ◽

Pit Depth ◽

Environment Performance ◽

Lock Gate

Influenced by surrounding environment, performance load and eroded by all kinds of media, the structure of lock gate prone to corrosion phenomena. Therefore, aimed at the situation of gate corrosion, to carry out the appraisal method for gate, a gate corrosion detection rating method is established. Based on the environment characteristics, taking corrosion appearance, coating thickness, the residue corrosion depth and corrosion pit depth as the index to evaluate,provides the judgment and evaluation basis for the lock gate is in need of repair.

Download Full-text