---
title: White Rust | one to ONE Holdings
description: White rust is a chalk-like zinc oxide that forms on galvanized steel. Learn its causes and how to prevent this corrosion from damaging your products.
image: https://www.o2oh.com/hubfs/o2Oh_18mm.jpg
---

Perfecting imperfections with one to ONE

# Glossary

### GLOSSARYTerms A-Z

- [Glossary](https://www.o2oh.com/glossary)
- [ALL](https://www.o2oh.com/glossary?val=all)
- [A～G](https://www.o2oh.com/glossary?val=a_g)
- [H～N](https://www.o2oh.com/glossary?val=h_n)
- [O～U](https://www.o2oh.com/glossary?val=o_u)
- [V～Z](https://www.o2oh.com/glossary?val=v_z)
- [Numbers ・ Symbols](https://www.o2oh.com/glossary?val=0_9)

# White Rust

White rust is a condition where a bulky zinc oxide, which is white or white with some faint brownish spots, forms on the surface of galvanized steel. Its appearance is like chalk powder adhering to the surface.

Immediately after the [galvanizing](https://www.o2oh.com/glossary/galvanizing) process, a thin, transparent oxide film begins to form on the surface. This film is not visible to the naked eye, allowing the steel's metallic gloss to be seen. However, when the product is exposed to the atmosphere, a dense zinc oxide film forms more thickly, and the gloss gradually fades. The initial brightness (Munsell value) of approximately N7 changes to a gray color of N6 to N6.5.

### RELATED WORDS

---

- [Well-being](https://www.o2oh.com/glossary/well-being)
- [World Steel Association (worldsteel)](https://www.o2oh.com/glossary/world-steel-association-worldsteel)

Copyright © one to ONE Holdings Pte. Ltd. All Rights Reserved.

```json
{
  "@context" : "http://schema.org",
  "@type" : "BlogPosting",
  "author" : {
    "@type" : "Person",
    "name" : "one to ONE Holdings",
    "url" : "https://www.o2oh.com/glossary/author/one-to-one-holdings"
  },
  "dateModified" : "2025-09-19T00:30:31+09:00",
  "datePublished" : "2025-09-19T00:29:32+09:00",
  "description" : "White rust is a chalk-like zinc oxide that forms on galvanized steel. Learn its causes and how to prevent this corrosion from damaging your products.",
  "headline" : "White Rust",
  "image" : {
    "@type" : "ImageObject",
    "url" : "https://8005843.fs1.hubspotusercontent-na1.net/hubfs/8005843/o2Oh_18mm.jpg"
  },
  "mainEntityOfPage" : {
    "@id" : "https://www.o2oh.com/glossary/white-rust",
    "@type" : "WebPage"
  },
  "publisher" : {
    "@type" : "Organization",
    "logo" : {
      "@type" : "ImageObject",
      "url" : "https://www.leadplus.net/hs-fs/hub/480402/file-2438142233.png"
    },
    "name" : "Glossary | one to ONE Holdings"
  }
}
```