51315-6011-Comparative Evaluation and Testing of Chromate and Non-chromate Primers in Coating Systems for Ballistic Missile Launch Tubes

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Product Number: 51315-6011-SG

ISBN: 6011 2015 CP

Author: Cindy O'Malley

Publication Date: 2015

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Currently the launch tubes of ballistic missile submarines are protected from corrosion by coating over a chromate-containing wash primer. To comply with environmental and worker protection regulations it is desirable to replace this legacy coating system with a system that does not contain chromates. The launch tube coatings must withstand both a seawater immersion which occurs immediately after launch as well as the physical stresses of the launch itself. While the performance of the legacy system is well known there is a concern that the long term performance history of the candidate replacement non-chromate coating systems under these conditions is not known. Standards developed for chromate-containing coatings and their non-chromate replacements address material composition installation and performance but these standards don't address the specific combination of environmental and physical conditions of the launch system.A test program was developed to compare the critical performance characteristics of the coating between the legacy and various candidate coating systems. Overall performance of fourteen coating systems produced by various manufacturers and designed to represent a variety of different coating chemistries was determined based on coupon test data generated in two phases: an initial phase addressing easier-to-test critical attributes and a second phase involving more costly testing which only tested those systems that performed as good as or better than the legacy system in the first phase. The data generated were used to rank the order of the overall coating system performance. The test conditions performance results and ranking details are presented