---
title: Protective Film Effect | one to ONE Holdings
description: Learn how the protective film effect, or zinc patina, forms a dense barrier to prevent corrosion in air, water, and soil.
image: https://www.o2oh.com/hubfs/o2Oh_18mm-1.jpg
---

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# Glossary

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# Protective Film Effect

In [galvanizing](https://www.o2oh.com/glossary/galvanizing), the protective film effect (often called the **zinc patina**) refers to the formation of a dense oxide/carbonate layer on the [zinc](https://www.o2oh.com/glossary/zinc) surface.

This layer is impermeable to oxygen and moisture, which slows corrosion and prevents rust. This protection functions in the atmosphere, as well as in water, soil, and concrete.

However, if the surface is exposed to strong acids, alkalis, or salts, this protective film is destroyed. Once the barrier is compromised, the zinc begins to corrode rapidly, forming [**white rust**](https://www.o2oh.com/glossary/white-rust).

Diagram of DSTI’s 'Daiwa Z Process,' a unique in-line galvanizing method.

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---

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- [Pre-Galvanizing](https://www.o2oh.com/glossary/pre-galvanizing)
- [PCR (Product Category Rules)](https://www.o2oh.com/glossary/pcr-product-category-rules)
- [Product Lifecycle Management (PLM)](https://www.o2oh.com/glossary/product-lifecycle-management-plm)

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