ASTM B177/B177M-11 (2021) PDF

Full title and description

ASTM B177/B177M-11(2021) — Standard Guide for Engineering Chromium Electroplating. This guide provides recommended practices for depositing engineering ("hard" or "functional") chromium by electroplating, including substrate preparation, racking, plating parameters, post-treatments (baking, mechanical finishing), repair procedures, and common test methods (thickness, hardness, adhesion).

Abstract

This standard guide describes procedures and considerations for obtaining smooth, adherent, and durable engineering chromium deposits of the thicknesses and properties required for functional uses on common engineering substrates (steels, cast irons, aluminum, copper alloys, nickel alloys, titanium, etc.). It is intended as guidance rather than a prescriptive single procedure and emphasizes substrate requirements, pretreatment (cleaning, deoxidizing, etching), racking/anode practice, plating process controls, post‑plate treatments to mitigate hydrogen embrittlement, finishing, repair, and test methods.

General information

• Status: Current / Active (reapproved).
• Publication date: Original designation B177/B177M-11 published 31 May 2011; reapproved/reissued in 2021 (designation shown as B177/B177M-11(2021), last updated Oct 21, 2021).
• Publisher: ASTM International (Committee B08 — Metallic and Inorganic Coatings).
• ICS / categories: 25.220.99 (Other treatments and coatings / surface treatments and coatings).
• Edition / version: B177/B177M-11 reapproved as B177/B177M-11(2021).
• Number of pages: 6 pages (short technical guide).

Scope

The guide covers engineering chromium electrodeposition primarily on ferrous substrates (steel, cast iron) but also addresses plating directly to other engineering metals such as aluminum, nickel alloys, copper and copper alloys, and titanium. It provides guidance for achieving desired thicknesses and physical properties without prescribing a single mandatory process; users are reminded to observe applicable safety and environmental practices and applicable related specifications (for example, Specification B650 for electrodeposited engineering chromium on ferrous substrates). Units are provided in both SI and inch‑pound; each system is to be used independently.

Key topics and requirements

• Overview of engineering chromium (hard chromium) vs decorative chromium and typical functional uses.
• Substrate preparation: cleaning, deoxidizing, and various etching methods (anodic etching, acid immersion, etc.).
• Racking and anode design considerations to ensure uniform deposit and minimize defects.
• Plating process parameters, control points, and typical defect causes.
• Post‑treatments: baking to reduce hydrogen embrittlement risk, mechanical finishing (grinding, honing, lapping).
• Repair procedures for chromium electrodeposits and practical guidance on rework.
• Common test and inspection methods: thickness measurement, hardness, adhesion tests, and acceptance considerations.
• Emphasis that the guide is not a prescriptive specification — purchasers and producers should agree on specific requirements where necessary.

Typical use and users

Plating shops, process engineers, metallurgists, quality and inspection personnel, maintenance engineers, and designers in aerospace, automotive, heavy machinery, oil & gas, defense, and tooling industries use this guide to develop, control, or verify hard chromium plating processes for wear, corrosion resistance, restoration of dimensions, and extended service life.

Related standards

Commonly referenced or related ASTM documents include Specification B650 (electrodeposited engineering chromium coatings on ferrous substrates), Practice/Standards for pre‑treatments and adhesion testing (examples: B242, B571), and hydrogen embrittlement test methods and treatments. Users should consult these and other current documents when developing procurement or process specifications.

Keywords

engineering chromium, hard chromium, chromium electroplating, plating process, substrate preparation, racking, etching, hydrogen embrittlement, thickness measurement, adhesion test, mechanical finishing.

FAQ

Q: What is this standard?

A: It is a short ASTM guide (B177/B177M-11 reapproved 2021) that provides recommended practices for engineering (functional/hard) chromium electroplating rather than a single prescriptive plating procedure.

Q: What does it cover?

A: Substrate requirements and preparation (cleaning, deoxidizing, etching), racking and anode considerations, process control topics, post‑plate treatments to mitigate hydrogen embrittlement, repair methods, finishing practices, and common test/inspection methods (thickness, hardness, adhesion). It is intended as guidance to achieve desired functional chromium deposits.

Q: Who typically uses it?

A: Plating facility engineers and technicians, metallurgists, quality/inspection staff, procurement/spec writers, and designers in industries that require wear/corrosion‑resistant or dimensionally restored surfaces (aerospace, automotive, oil & gas, defense, tooling).

Q: Is it current or superseded?

A: The B177/B177M-11 edition was originally issued in 2011 and was reapproved/reissued with a 2021 reapproval; catalog listings and the ASTM product page list the guide as active/current as of the 2021 reapproval. Users should confirm the latest status with ASTM for procurement or normative references.

Q: Is it part of a series?

A: Yes — it is part of ASTM’s Paint Standards and Related Coating Standards (Committee B08) covering metallic and inorganic coatings; other related ASTM standards address specific plating materials, pre‑treatment, adhesion testing, and hydrogen embrittlement evaluation.

Q: What are the key keywords?

A: engineering chromium, hard chromium, chromium plating, racking, etching, hydrogen embrittlement, thickness measurement, adhesion, mechanical finishing.