ISO 9223 Zinc Corrosion Rate (2020–2024)

Overview

This dataset represents the modeled first-year atmospheric corrosion rate of zinc based on the ISO 9223 atmospheric corrosivity framework.

Corrosion rates were calculated using five-year climatological averages (2020–2024) of:

• Temperature
• Relative Humidity
• Sulfate Deposition
• Chloride Deposition

The resulting raster provides:

• First-year zinc corrosion rate estimates
• ISO 9223 corrosivity classifications
• Continuous atmospheric corrosion exposure mapping

at approximately 1 km spatial resolution.

Units:

• Micrometers per year (µm/year)

Background

ISO 9223 provides internationally recognized dose-response functions for estimating atmospheric corrosion rates of engineering materials using climatic and pollutant exposure variables.

This dataset applies the ISO 9223 zinc dose-response function to generate global corrosion rate predictions using gridded environmental datasets representing average conditions during the period 2020–2024.

ISO 9223 Zinc Dose-Response Function

The zinc corrosion model is:

math r_{corr} = 0.0129 \cdot P_D^{0.44} \cdot exp(0.046 \cdot RH + f_{Zn}) + 0.0175 \cdot S_D^{0.57} \cdot exp(0.008 \cdot RH + 0.085 \cdot T)

where:

math f_{Zn} = 0.038 \cdot (T - 10) \quad \text{if } T \leq 10^\circ C

math f_{Zn} = -0.071 \cdot (T - 10) \quad \text{if } T > 10^\circ C

Variable Definitions

ISO 9223 Corrosivity Categories (Zinc)

Engineering Interpretation Classes

For visualization and continuous raster interpretation, the following intermediate classes are provided:

These intermediate classes are not part of the ISO 9223 standard and are provided solely for GIS visualization and continuous corrosion exposure interpretation.

Interpretation Notes

Lower corrosion rates are typically associated with:

• Arid climates
• Inland environments
• Low humidity regions
• Low pollutant exposure

Higher corrosion rates are typically associated with:

• Marine environments
• Coastal exposure
• Humid tropical climates
• Elevated chloride deposition
• Elevated sulfate deposition

Zinc corrosion behavior is particularly sensitive to chloride deposition, persistent humidity, and acidic atmospheric conditions.

Spatial Resolution

Data Sources

Primary environmental inputs include:

• NOAA Integrated Surface Database (ISD)
• Government of Canada Climate Archive
• NASA MERRA-2 Reanalysis
• National Data Buoy Center (NDBC)
• EPA National Atmospheric Deposition Program (NADP)

Derived raster inputs include:

• Mean Annual Temperature
• Mean Relative Humidity
• Mean Chloride Deposition
• Mean Sulfate Deposition
• Time of Wetness (TOW)

Intended Applications

This dataset may be used for:

• Atmospheric corrosion assessment
• Galvanized steel durability studies
• Corrosion engineering
• Asset integrity management
• Environmental exposure analysis
• GIS visualization

Related Datasets

Primary Corrosion Layers

• ISO 9223 Steel Corrosion Rate
• ISO 9223 Zinc Corrosion Rate
• ISO 9223 Aluminum Corrosion Rate
• ISO 9223 Copper Corrosion Rate

Enhanced LE (Local Emissions) Corrosion Layers

• ISO 9223 Steel LE V4
• ISO 9223 Zinc LE V4
• ISO 9223 Aluminum LE V4
• ISO 9223 Copper LE V4

Supporting Environmental Layers

• Mean Chloride Deposition
• Mean Sulfate Deposition
• Mean Annual Temperature
• Mean Relative Humidity
• Time of Wetness (TOW)

Supporting Coastal & Terrain Layers

• Distance to the Nearest Coast
• Bathymetry 2024 – Terrain Elevation
• WindRIX Terrain–Wind Exposure Index
• Wind Resultant Direction (0–360°)
• Wind Speed

Attribution

Joseph Mazzella
AtmosphericIQ LLC
Engineering Director, Inc.

Dataset Citation

Mazzella, J. (2026). ISO 9223 Zinc Corrosion Rate Raster (2020–2024). AtmosphericIQ LLC / Engineering Director, Inc.

Standards Citations

ISO 9223:2012. Corrosion of metals and alloys — Corrosivity of atmospheres — Classification, determination and estimation.

ISO 12944-2. Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 2: Classification of environments.

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