MCO 4790.18C governs the Marine Corps Corrosion Prevention and Control Program for tactical ground and ground support equipment.
View MCO 4790.18C on armypubs.army.mil
It establishes preventive and corrective corrosion control, corrosion prevention products and materials, coatings, controlled humidity protection, and corrosion assessments. It requires approved techniques, materials, and technologies, and sets corrosion assessment and category requirements.
Preventive corrosion control procedures employ approved techniques, materials, and technologies. (paragraph 1)
Preventing corrosion starts during the acquisition process and is continued throughout the life cycle. (paragraph 1)
Corrective corrosion control focuses on identifying, developing, and implementing technologies and processes that will correct current equipment deficiencies resulting from corrosion and environmental damage. (paragraph 2)
Corrosion Control and Coatings however, does not replace the requirement for crew/operator maintenance. (paragraph 2)
By maintaining relative humidity (RH) below 50 percent, the adverse effects of humidity are eliminated; the rate of corrosion growth shifts from linear to exponential above 50 percent RH. (paragraph 3)