ASTM B571 Standard Practice for Qualitative Adhesion Testing of Metallic Coatings

    ASTM B571 Introduction

    ASTM B571 offers qualitative, mostly destructive, and semi-destructive testing that indicates whether a metallic coating is well bonded to its substrate and whether failures are adhesive (at the coating/substrate interface) or cohesive (within the coating). The practice does not yield a single numeric adhesion strength but a pass/fail or qualitative ranking, beneficial for production control, comparative studies, and acceptance of plated parts. There are several tests explained because coating, ductility of the substrate, and thickness all vary significantly; therefore, a standard test choice is made to fit the coating type and anticipated failure mechanism. In cases where direct testing of a completed part is not practical, B571 allows test panels plated in one production cycle to simulate the product item.

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    ASTM B571 Test Method

    Scribe/GridA sharp scribe or cutter makes intersecting cuts through the coating to the substrate (grid spacing chosen by coating thickness), followed by application and removal of adhesive tape to check for coating removal at cut edges; useful for thin, brittle coatings and for comparative acceptance.
    Peel/Push/90° PeelA tab of coating is lifted or a dolly bonded and pulled (or a mechanical fixture used for 90° peel) to observe whether the coating peels cleanly from the substrate; used when the coating will peel without tearing and to expose adhesive vs. cohesive failure.
    Bend / Impact / File / KnifeMechanical deformation (bending, impact, filing, or attempting to lift with a knife) stresses the coating/substrate bond to reveal flakes, cracks, or delamination; chosen according to substrate ductility and coating thickness and interpreted visually.

    ASTM B571 Equipment and Sample Preparation

    Test panelsUse parts or representative panels plated in the same cycle. Panels should match substrate alloy, surface finish and preplating treatment; when used, panel dimensions commonly ~75 mm × 150 mm (3 × 6 in) to allow multiple tests and clamps.
    Cutting/scribing toolsSharp utility knife or cross-cut cutter with blade spacing appropriate to coating thickness (typical grid spacing 1.0 mm for thin decorative coatings, larger for thicker coatings); blades must be clean and undamaged. 
    Adhesives/dollies/fixturesPressure-sensitive tapes conforming to the agreed specification for tape test; dollies and epoxy for pull/peel tests must provide a bonded area adequate for fixture (typical dolly diameters 10–20 mm). Fixtures for 90° peel or tensile pull should be rigid and aligned to avoid bending.

    ASTM B571 Test Results and Interpretation

    Results are documented qualitatively by observation of apparent removal, flaking, cracking, or substrate exposure. Adhesive failure (coating peels away cleanly to expose substrate) equals poor bond; cohesive failure (coating tears or peels away partially) equals internal weakness within the coating. Certain tests (peel/dolly) may be used in conjunction with quantitative pull-off instruments to provide force information, but B571 itself is a qualitative practice in which trained examiners make acceptability judgments according to prearranged criteria. Marginal outcomes frequently call for more quantitative testing or a process audit.

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    Key related standards include ASTM D3359 (adhesion by tape testing for paints/coatings), ASTM D6677 (knife adhesion methods), and ASTM B449 / B447 family documents that cover specific plating practices and qualification.

    Materials Commonly Tested with ASTM B571 

    B571 is used in decorative and functional metallic platings like nickel, chromium, copper, silver, gold, tin, and zinc on steel, brass, aluminum, and other engineering alloys. The selection of a particular subtest is a function of coating ductility and thickness; for instance, thin decorative chromium tends to use grid/tape tests, while thicker functional coatings can be tested by impact, bend, or peel tests.

    Applications of ASTM B571 in Industry

    Use B571 for the approval of industry production controls, upcoming inspections, and muddy parts ranging from aerospace and automotive to electronics, jewelry, and hardware. Because adhesion affects rust safety, appearance, and functional life, B571 helps manufacturers confirm that plating procedures (surface preparation, strike layer, deposit parameters) achieved a stable coating before shipment.

    Safety and Best Practices in ASTM B571 

    B571 reminds users that tests are disastrous and can produce sharp pieces; Care is required with safe handling, eye safety, and cutting appliances and hot/extinguished samples. The best practice calls for the agreed acceptance criteria between the supplier and the buyer, the use of representative testing panels when direct testing is impossible, and documentation of the status of the environment and procedure to aid recurrence.

    Importance of ASTM B571  

    Though qualitative, ASTM B571 is useful since it is quick, cheap, and well related to actual failure modes. As a first-line test, when applied with proper specimen selection and rules of interpretation, B571 is an effective tool for catching adhesion issues early and avoiding expensive field failures.

    FAQ

    Where can I get the astm b571 tested?
    You can share your astm b571 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm b571 test to various testing techniques.
    Please contact us for a detailed quote for your astm b571 testing needs. Cost incurred to carry out different astm b571 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
    The required number of samples or specimens should comply with the procedure given in the astm b571 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
    MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
    The turnaround time for astm b571 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

    Updated on September 17, 2026

    Davis Scott
    About Author
    Davis Scott
    Davis Scott is an Electrical and Electronics Engineer specializing in multidisciplinary validation, quality assurance, and comprehensive electro-mechanical testing.
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