ISO 18070:2015 PDF

Corrosion of metals and alloys — Crevice corrosion formers with disc springs for flat specimens or tubes made from stainless steel

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Title (English):

ISO 18070:2015

Corrosion of metals and alloys — Crevice corrosion formers with disc springs for flat specimens or tubes made from stainless steel

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 9
Publication date:: November 5, 2015
Edition:: ISO IS 18070 edition 1 version 1
ICS:: 77.060

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Description (English):

ISO 18070:2015 specifies a crevice forming technique and crevice former which are intended to be used for crevice corrosion testing of flat specimens or tubes of stainless steels, in corrosive solutions. This International Standard specifies no information concerning how the crevice corrosion testing shall be performed and how the attack shall be evaluated. The crevice former specified in this International Standard can be used for electrochemical measurements, if the specimens are designed for electrical connections.

Technical details

Technical committee: ISO/TC 156 - Corrosion of metals and alloys
SKU: ISO 18070:2015

Abstract

Overview

ISO 18070:2015 - "Corrosion of metals and alloys - Crevice corrosion formers with disc springs for flat specimens or tubes made from stainless steel" specifies a standardized crevice-forming technique and hardware (crevice former) for laboratory crevice corrosion testing of stainless-steel flat specimens and tubes in corrosive solutions. The document defines the mechanical assembly, materials, specimen geometry and surface preparation of the crevice former and associated disc-spring loading system. It does not prescribe how to carry out the corrosion test procedure or how to evaluate attack - only the crevice former design and handling.

Key topics and technical requirements

Crevice former design: PVDF crevice formers (OD 20 mm, ID 7 mm, height 15 mm) for flat specimens; tubular formers include a curvature matching the tube OD and minimum thickness 5 mm. PVDF usable to ~95 °C.
Loading system: Disc springs (Belleville washers) with a calibrated linear force–deflection relationship (reference DIN 2093). Typical assembly uses four springs to achieve ~0.9 kN (~3 Nm torque for flat specimens).
Assembly components & materials: Nut, bolt and washers (rings) typically made from titanium; disc springs made from titanium or nylon-coated steel. Insulating PVC/PE hose and PTFE centering rings prevent electrical contact and align parts.
Specimen requirements: Minimum outer surface area ≥ 100 cm²; flat specimens and tubes require a central 7 mm hole; tubes at least 30 mm long.
Surface preparation & cleanliness: Test surfaces normally abraded to at least P120 grit (ISO 6344-3); crevice formers wet-ground to at least P1200. Clean specimens with degreasing, high-purity water (conductivity

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Crevice former design: PVDF crevice formers (OD 20 mm, ID 7 mm, height 15 mm) for flat specimens; tubular formers include a curvature matching the tube OD and minimum thickness 5 mm. PVDF usable to ~95 °C.
Loading system: Disc springs (Belleville washers) with a calibrated linear force–deflection relationship (reference DIN 2093). Typical assembly uses four springs to achieve ~0.9 kN (~3 Nm torque for flat specimens).
Assembly components & materials: Nut, bolt and washers (rings) typically made from titanium; disc springs made from titanium or nylon-coated steel. Insulating PVC/PE hose and PTFE centering rings prevent electrical contact and align parts.
Specimen requirements: Minimum outer surface area ≥ 100 cm²; flat specimens and tubes require a central 7 mm hole; tubes at least 30 mm long.
Surface preparation & cleanliness: Test surfaces normally abraded to at least P120 grit (ISO 6344-3); crevice formers wet-ground to at least P1200. Clean specimens with degreasing, high-purity water (conductivity

ISO 18070:2015 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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