Overview
ISO 19097-1:2018 specifies an accelerated life test method for mixed metal oxide (MMO) anodes used for impressed current cathodic protection (ICCP) embedded in concrete. The standard defines laboratory procedures to accelerate anode degradation under controlled electrochemical conditions so that manufacturers, specifiers and corrosion engineers can compare durability and assess whether anodes meet a required design life expectancy at rated current output. It is also adaptable to other impressed-current anode systems embedded in concrete with suitably modified test fixtures.
Key topics and technical requirements
- Test purpose: Determine anode accelerated life and compare stability between MMO anodes; not intended to predict exact in‑service lifetime but to verify design-life compliance.
- Test methods: Two parts
- Part A - full evaluation to determine whether the anode material can meet expected lifetime; includes current reversal preconditioning.
- Part B - quicker batch verification test for production samples after Part A acceptance.
- Electrolytes and solutions:
- 30 g/L NaCl to simulate chloride‑contaminated environments and chlorine evolution conditions.
- 40 g/L NaOH to simulate high‑pH pore solutions in new concrete and oxygen evolution conditions.
- Simulated pore water in sand (specified mass proportions of NaOH, KOH, KCl, Ca(OH)2 with fine silica sand) to mimic cured concrete pore water with limited convective mixing.
- Alternative aggressive solutions (e.g., 1 M H2SO4, 1 M Na2SO4) for Part B to force oxygen evolution.
- Apparatus and specimen:
- Typical cell: tall-form glass beaker (~1.0 L) with rubber stopper, ~50 mm anode–cathode gap, venting for gases, Luggin probe for potential measurement.
- Sample connection details and specified anode surface area (see standard for exact dimensions and welding/connection requirements).
- Measured parameters: cell voltage, charge density, current density, ripple and accumulated charge until anode deactivation. Reporting and post-test specimen treatment are specified.
Applications and users
- Applications: Specification and qualification of MMO anodes for cathodic protection of reinforced concrete structures (bridges, piers, pilings, marine infrastructure) where chloride contamination and high pH pore water are concerns.
- Who uses it: Anode manufacturers, third‑party test laboratories, corrosion engineers, asset owners and designers specifying ICCP systems for concrete structures.
Related standards
- ISO 679 - Cement - Test methods - Determination of strength
- ISO 8044 - Corrosion of metals and alloys - Basic terms and definitions
- Note: ISO 19097-1 draws from NACE TM0294-2016; consult the full ISO 19097 series for related parts and scope extensions.
Keywords: ISO 19097-1:2018, mixed metal oxide anodes, MMO anode, accelerated life test, cathodic protection, ICCP, concrete, simulated pore water, NaCl, NaOH, anode durability.