Galvanic Corrosion in Shell Shock NAS3 Cases

Published on March 28, 2017
Duration: 6:42

This video investigates galvanic corrosion in Shell Shock NAS3 casings after a 1000-round test and subsequent exposure. The instructor, with a background in chemistry, explains the principles of galvanic corrosion and tests casings left on a range for 90 days and submerged in a salt bath. The findings indicate that the nickel plating on the aluminum base effectively insulates it from the ferromagnetic nickel body, preventing significant galvanic corrosion under normal use conditions.

Quick Summary

Shell Shock NAS3 casings are designed to resist galvanic corrosion due to their construction. They feature a nickel-plated aluminum base that acts as an insulator, preventing the less noble aluminum from corroding when in contact with the ferromagnetic nickel body.

Chapters

  1. 00:01Introduction: NAS3 Casing Test Recap
  2. 01:11What is Galvanic Corrosion?
  3. 01:52NAS3 Casing Composition
  4. 02:58Test Methodology: Range vs. Salt Bath
  5. 03:30Results: Range Exposed Casings
  6. 03:51Results: Salt Bath Exposed Casings
  7. 04:39Disassembly and Analysis
  8. 05:02The Role of Nickel Plating
  9. 05:28Conclusion: NAS3 Corrosion Claims Validated

Frequently Asked Questions

What is galvanic corrosion and how does it apply to firearm casings?

Galvanic corrosion occurs when two dissimilar metals interact in an electrolyte, causing one to corrode preferentially. For firearm casings, this could potentially affect the base or body if different metals are in contact without proper insulation.

Are Shell Shock NAS3 casings susceptible to galvanic corrosion?

Based on testing, Shell Shock NAS3 casings are not significantly susceptible to galvanic corrosion. The nickel plating on the aluminum base acts as an effective insulator, preventing the interaction that would lead to corrosion.

What materials are Shell Shock NAS3 casings made from?

Shell Shock NAS3 casings are made from an unknown ferromagnetic alloy containing nickel for the body, and feature a nickel-plated aluminum base.

How did the test simulate harsh conditions for NAS3 casings?

The test involved leaving casings on a range for 90 days and also submerging a separate set in a salt bath for the same duration to observe their resistance to environmental degradation and corrosion.

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