UNCLASSIFIED

UNCLASSIFIED

EXPERIMENTAL METHODS FOR MULTI-GENRE NETWORKS

Introduction: Armor alloys and variations of the Chemical Agent Resistant Coating (CARC), including pretreatment, primer, and top-coat, are continuously evaluated at ARL in order to ensure conformance with military specifications. The ASTM B117 Neutral Salt Fog, GMW14872 Cyclic Corrosion and outdoor exposure are the three test being compared in this research.

Objective: The objective in this research was to compare outdoor exposure and accelerated corrosion, to see if machine learning / AI could assist in identifying any correlation between the test methods.

Figure 1: Outdoor exposure of armor alloys at Cape Canaveral Air Force Station

Figure 2: GMW 14872 Cyclic Corrosion test

Figure 3: ASTM B117 Neutral Salt Fog test

Figure 4: Average scribe ratings for three pretreatments across the three corrosion test methods

Table 1 Scribe Rating Pretreatment: Chromated Wash Primer

B117Time

(hours) Cyclic Time

(cycles) OutdoorTime

(months)8 336 8.4 15 10 6

6.9 672 7.3 30 5.1 126.6 1008 6.9 45 3.2 186.5 1344 5.9 60 2.4 246.5 1680 Exposure Ended 1.3 30

Exposure Ended 1.6 36Exposure Ended

Table 1: Shows the comparison between the three test while using chromated wash primer pretreatment on mill finished steel with primer (MIL-DTL-53030) and topcoat (MIL-DTL-53039)

Table 2 Scribe Rating Pretreatment: Chrome Free Conversion Coating

B117Time

(hours) Cyclic Time

(cycles) OutdoorTime

(months)8.4 336 9 15 10 67 672 6.8 30 8.6 126 1008 6.8 45 7 18

5.6 1344 6 60 6.4 245.6 1680 Exposure Ended 5.8 30

Exposure Ended 5.8 364.8 42Exposure Ended

Table 3 Scribe Rating Pretreatment: Zinc Rich Primer

B117Time

(hours) Cyclic Time

(cycles) OutdoorTime

(months)8.4 336 9.3 15 9.1 67.1 672 8.6 30 9.1 125.3 1008 8 45 9.1 18

Exposure Ended 7.7 60 9 247.3 75 9 306.9 90 9 366.6 105 9 426.4 120 9 48

Exposure Ended Exposure Ended

Table 2: Shows the comparison between the three test while using chrome free conversion coating pretreatment on mill finished steel

with primer (MIL-DTL-53030) and topcoat (MIL-DTL-53039)

Table 3: Shows the comparison between the three test while using zinc rich primer pretreatment on mill finished steel with

primer (MIL-DTL-53022) and topcoat (MIL-DTL-53039)

References: All data provided by Army Research Laboratory

Conclusion:• Rating decrease with exposure time • Given significant amount of data, analysis technique is

inadequate to find a direct correlation between the three tests • Machine learning/ AI is well suited to find any correlations

Comparing Test Results Obtained in Accelerated Corrosion and Real-World Exposure

By: Kenneth WattsCoatings and Corrosion Team

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