ISO 16701:2015 PDF

Corrosion of metals and alloys — Corrosion in artificial atmosphere — Accelerated corrosion test involving exposure under controlled conditions of humidity cycling and intermittent spraying of a salt solution

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Title (English):

ISO 16701:2015

Document status:: Withdrawn
Format:: Electronic (PDF)
Number of pages:: 13
Publication date:: May 21, 2015
Edition:: ISO IS 16701 edition 2 version 1
ICS:: 77.060

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Description (English):

ISO 16071:2015 specifies the test method, the reagents, and the procedure to be used in an accelerated atmospheric corrosion test constituting a 6 h exposure to a slightly acidified solution of 1 % NaCl twice weekly, followed by a condition of controlled humidity cycling between 95 % RH and 50 % RH at a constant temperature of 35 °C. It does not specify the dimensions of the tests specimens, the exposure period to be used for a particular product, or the interpretation of the results. Such details are provided in the appropriate product specifications. The accelerated laboratory corrosion test applies to metals and their alloys, metallic coatings (anodic or cathodic), chemical conversion coatings, and organic coatings on metallic materials.

Technical details

Technical committee: ISO/TC 156 - Corrosion of metals and alloys
SKU: ISO 16701:2015

Abstract

Overview

ISO 16701:2015 defines an accelerated atmospheric corrosion test that combines controlled humidity cycling with intermittent spraying of a salt solution. Developed in the automotive context, the method reproduces cyclic salt and humidity conditions (e.g., winter de-icing salts) to assess the corrosion performance of metals, alloys and coatings under moderately forced laboratory conditions. The standard describes the test method, reagents and procedure, but does not prescribe specimen dimensions, total exposure periods or result interpretation - those are supplied in product specifications.

Key topics and technical requirements

Test cycle and exposure: The procedure includes a 6 h exposure to a slightly acidified 1 % NaCl solution twice weekly, followed by controlled humidity cycling between 95 % RH and 50 % RH at a constant 35 °C. Test cycles are organized into 12 h sequences with periodic spraying cycles.
Salt solution: Prepare at 10 g/L ± 1 g/L NaCl in deionized/distilled water (conductivity ≤ 2 mS/m). Adjust pH to 4.2 ± 0.1 with dilute sulfuric acid. Maximum impurity levels for NaCl (e.g., Cu, Ni 0.001 %) are specified.
Climate chamber: Must control and monitor humidity and temperature closely - instantaneous RH deviation ±4 % (50–95 % RH) and mean RH accuracy ±2 % over 7–8 h. RH must be changeable linearly between 95 % and 50 % within 2 h.
Spraying device: Produce a uniform vertical mist at a linear flow rate of 15 mm/h ± 5 mm/h (≈ collection 120 ml/h ± 40 ml/h using specified collector). Materials in contact with salt must be corrosion-resistant and not alter corrosivity.
Forced drying and airflow: A system for forced drying after spray (supercool/reheat or pre-heated airflow) is required to avoid prolonged macroscopic wetness.
Specimen handling: Non-metallic stands, specimen angle preferably 20° ± 5° to vertical. Protect cut edges and record material, pretreatment, coating thickness and any intentional damage.
Limitations: Noted risk of exaggerated pitting for some low-alloy/austenitic stainless steels; unsuitable for wax/oil rust protection agents due to constant elevated temperature.

Applications and practical value

Quality assurance and comparative evaluation of:
- metallic substrates and alloys,
- metallic (anodic/cathodic) coatings,
- chemical conversion coatings, and
- organic coatings on metals.
Widely used by automotive OEMs and suppliers, corrosion and materials engineers, independent testing laboratories, and coating manufacturers to simulate salt-driven cyclic atmospheric corrosion and benchmark protective systems.

Who should use ISO 16701

Corrosion engineers, materials scientists, product and coatings developers, QA/QC labs, OEM specification writers and standards committees seeking a reproducible accelerated test that better correlates with cyclic salt exposure than continuous salt spray.

Related standards

ISO 4628 series (coating degradation evaluation)
ISO 8407 (removal of corrosion products)
ISO 10289 (rating of test specimens after corrosion tests)
Developed under ISO/TC 156 (Corrosion of metals and alloys)

Keywords: ISO 16701, accelerated corrosion test, humidity cycling, salt spray, 1% NaCl, climate chamber, corrosion testing, coating durability, automotive corrosion testing.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Test cycle and exposure: The procedure includes a 6 h exposure to a slightly acidified 1 % NaCl solution twice weekly, followed by controlled humidity cycling between 95 % RH and 50 % RH at a constant 35 °C. Test cycles are organized into 12 h sequences with periodic spraying cycles.
Salt solution: Prepare at 10 g/L ± 1 g/L NaCl in deionized/distilled water (conductivity ≤ 2 mS/m). Adjust pH to 4.2 ± 0.1 with dilute sulfuric acid. Maximum impurity levels for NaCl (e.g., Cu, Ni 0.001 %) are specified.
Climate chamber: Must control and monitor humidity and temperature closely - instantaneous RH deviation ±4 % (50–95 % RH) and mean RH accuracy ±2 % over 7–8 h. RH must be changeable linearly between 95 % and 50 % within 2 h.
Spraying device: Produce a uniform vertical mist at a linear flow rate of 15 mm/h ± 5 mm/h (≈ collection 120 ml/h ± 40 ml/h using specified collector). Materials in contact with salt must be corrosion-resistant and not alter corrosivity.
Forced drying and airflow: A system for forced drying after spray (supercool/reheat or pre-heated airflow) is required to avoid prolonged macroscopic wetness.
Specimen handling: Non-metallic stands, specimen angle preferably 20° ± 5° to vertical. Protect cut edges and record material, pretreatment, coating thickness and any intentional damage.
Limitations: Noted risk of exaggerated pitting for some low-alloy/austenitic stainless steels; unsuitable for wax/oil rust protection agents due to constant elevated temperature.

Applications and practical value

Quality assurance and comparative evaluation of:
- metallic substrates and alloys,
- metallic (anodic/cathodic) coatings,
- chemical conversion coatings, and
- organic coatings on metals.
Widely used by automotive OEMs and suppliers, corrosion and materials engineers, independent testing laboratories, and coating manufacturers to simulate salt-driven cyclic atmospheric corrosion and benchmark protective systems.

Who should use ISO 16701

Corrosion engineers, materials scientists, product and coatings developers, QA/QC labs, OEM specification writers and standards committees seeking a reproducible accelerated test that better correlates with cyclic salt exposure than continuous salt spray.

Related standards

ISO 4628 series (coating degradation evaluation)
ISO 8407 (removal of corrosion products)
ISO 10289 (rating of test specimens after corrosion tests)
Developed under ISO/TC 156 (Corrosion of metals and alloys)

Keywords: ISO 16701, accelerated corrosion test, humidity cycling, salt spray, 1% NaCl, climate chamber, corrosion testing, coating durability, automotive corrosion testing.

ISO 16701:2015 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and practical value

Who should use ISO 16701

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and practical value

Who should use ISO 16701

Related standards

Related standards

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