Salt Mist Test Chamber / OK-FH-90 Corrosion Testing Chamber

Overview

The OK-FH-90 Salt Mist Test Chamber is an engineered environmental test system designed for standardized evaluation of material and coating resistance to chloride-induced electrochemical corrosion. It operates on the principle of controlled salt spray (NaCl aerosol) generation in a thermally and hygrothermally regulated chamber, simulating accelerated corrosive environments per internationally recognized test standards including ASTM B117, ISO 9227, JIS Z2243, and GB/T 2423.17. Unlike ambient exposure testing—which may require months or years—the OK-FH-90 enables reproducible, time-compressed assessment of corrosion initiation, pitting depth, blistering, red rust formation, and coating delamination under rigorously defined climatic parameters. Its dual capability to maintain stable temperature (+5°C to 55°C) and high relative humidity (85–95% RH), combined with precise salt solution atomization and uniform deposition (1–2 mL/80 cm²·h), ensures compliance with critical test method requirements for automotive components, marine hardware, aerospace fasteners, galvanized steel substrates, and electronic enclosures.

Key Features

• Corrosion-resistant chamber construction using UV-stabilized, reinforced PVC rigid plastic—both interior lining and exterior casing—providing long-term resistance to acidic salt mists, oxidation, and thermal aging.
• Full-transparent, impact-resistant acrylic lid with integrated water-seal gasket prevents aerosol leakage and enables real-time visual monitoring without interrupting test conditions.
• Pneumatically assisted lid actuation mechanism ensures smooth, ergonomic opening/closing while maintaining structural integrity over repeated cycles.
• U-shaped titanium alloy immersion heater located in the bottom water reservoir delivers rapid thermal response and exceptional temperature uniformity (≤ ±2°C) across the 900 × 600 × 500 mm test volume.
• High-accuracy digital PID microcomputer controller with PT100 platinum RTD sensor achieves ±0.1°C setpoint stability and supports programmable ramp-hold profiles for multi-stage corrosion protocols.
• Adjustable timer range from 1 second to 999 hours allows flexible scheduling of continuous or cyclic salt spray exposure—including dry, wet, and humid phases when integrated with optional humidity control modules.
• Standard inclusion of one certified SO₂ gas cylinder (with pressure regulator) enables execution of acidified salt spray tests (e.g., ASTM G85 Annex A2) for evaluating sulfur-sensitive alloys and painted systems.

Sample Compatibility & Compliance

The OK-FH-90 accommodates test specimens up to 600 mm wide and 500 mm tall, with unobstructed access via front-opening design and adjustable sample racks. It supports flat panels, machined parts, assembled subassemblies, and coated coupons conforming to ISO 1514 and ASTM D609 dimensional specifications. All operational parameters—including salt concentration (5% NaCl w/w unless otherwise specified), pH (6.5–7.2 for neutral salt spray), and collection rate—are traceable and verifiable per ISO/IEC 17025 laboratory accreditation requirements. The chamber’s design meets CE marking directives for low-voltage equipment (2014/35/EU) and electromagnetic compatibility (2014/30/EU), and its control firmware supports audit-ready logging for GLP and GMP-aligned quality systems.

Software & Data Management

While the base configuration features standalone microcontroller operation, optional RS485/Modbus RTU interface enables integration with centralized lab management platforms (e.g., LabVantage, STARLIMS) or SCADA-based environmental monitoring networks. Real-time temperature and timer status are displayed locally; event-triggered data logging (via external USB or Ethernet gateway) captures timestamped setpoints, deviations, and alarm states. For regulatory submissions, exported CSV logs include instrument ID, operator code, calibration certificate references, and environmental deviation flags—fully compatible with FDA 21 CFR Part 11 compliant electronic record workflows when paired with validated third-party software.

Applications

• Evaluation of zinc-plated, cadmium-plated, and aluminum anodized finishes per automotive OEM specifications (e.g., GMW 14872, Ford CETP 00.00-L-467).
• Qualification of powder-coated enclosures used in coastal infrastructure and offshore wind turbine nacelles.
• Comparative analysis of organic coating adhesion and blister resistance under cyclic salt-humidity stress (ISO 11997-1).
• Pre-qualification screening of printed circuit board conformal coatings prior to IPC-A-610 or MIL-STD-202G testing.
• Process validation of electroplating bath performance and post-treatment passivation efficacy.

FAQ

What standards does the OK-FH-90 comply with for salt spray testing?

It is configured to meet the core requirements of ASTM B117, ISO 9227, and JIS Z2243 for neutral salt spray (NSS), with optional SO₂ capability supporting ASTM G85 Annex A2 (acidified salt spray).
Can the chamber perform cyclic corrosion testing (CCT)?

The standard unit supports timed on/off spray cycling; full CCT (dry/humid/salt phases) requires optional humidity control add-on and external programmable logic controller integration.
Is calibration documentation provided with shipment?

Yes—a factory calibration certificate traceable to NIST-equivalent national standards is included, covering temperature sensor accuracy and timer functionality.
What maintenance is required for long-term reliability?

Daily drain/fill of the salt solution reservoir, monthly inspection of nozzle orifices and water seal integrity, and biannual verification of PT100 sensor drift using certified reference thermometers.
Does the system support remote monitoring?

Via optional communication module (RS485/Modbus), enabling read-only parameter polling and alarm notification through existing facility SCADA or building management systems.