Name: ISO 18070:2015 — Corrosion of metals and alloys — Crevice corrosion formers with disc springs for flat specimens or tubes made from stainless steel
SKU: ISO 18070:2015
Price: 25 EUR
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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

ISO 18070:2015 PDF

Abstract

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Overview

Key topics and technical requirements

Технические детали

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