How SPA-H Builds Its "Rust Armor" (3 Simple Stages)
Stage 1: "Normal Rust" (Like Any Steel)
At first, SPA-H rusts like regular steel – forming flaky, orange-brown rust (mostly ).
This early rust washes away in rain, exposing fresh metal underneath.
Stage 2: "Smart Rust" (Alloys Kick In)
They fill gaps between rust particles, turning loose powder into a dense layer.
adds corrosion-resistant "shields" (Cr₂O₃) inside the rust.
Stage 3: "Self-Healing Armor" (Final Patina)
After ~2 years, the rust evolves into:
: Soft "sacrificial" rust (washes off slowly).
-FeOOH (goethite) that blocks water/oxygen.
5x denser than normal rust (like comparing sponge vs. ceramic).
Scratches "heal" themselves by re-rusting in a protective way.
Real-World Analogy
Think of SPA-H's rust like :
=Peeling birch bark (messy but natural).
=Thick oak bark (protects for decades).
