---
title: "ASTM B578 — Citation Detail"
description: >-
  Reference method for Vickers and Knoop microhardness testing of thin coatings, including hard anodize. Specifies indenter load selection (typically 25-100 gf fo
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last_modified: 2026-05-24
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## Abstract

Reference method for Vickers and Knoop microhardness testing of thin coatings, including hard anodize. Specifies indenter load selection (typically 25-100 gf for hard anodize at 30-75 μm thickness), measurement procedure on metallographic cross-sections, and reporting. Hard anodize microhardness is typically reported as HV50 (Vickers at 50 gf load); properly run hard anodize on 6061 alloy typically achieves >400 HV50.

## Source details

- **Type:** Standard
- **Year:** 1987
- **Edition:** Reapproved 2020
- **Issuer / Authors:** ASTM International
- **Official source:** <https://www.astm.org/standards/b578>
- **Access:** Paywalled via ASTM Compass
- **Last verified:** 2026-05-21

## Related references

- [MIL-A-8625F](/reference/mil-a-8625-rev-f) — standard, 2003
- [AMS 2469](/reference/ams-2469) — standard, 2020