Research on Industrial Corrosive Environment Simulation Detection Based on Sulfur Dioxide Test Chamber

Abstract
Sulfur dioxide (SO₂) serves as a dominant corrosive medium triggering deterioration and failure of metal materials, plating layers, coatings and complete equipment in industrial atmospheric environment. The sulfur dioxide test chamber can accurately regulate SO₂ concentration, temperature and other pivotal parameters to faithfully restore actual industrial sulfur corrosion scenarios, realizing accelerated evaluation and defect detection of anti-sulfur corrosion performance of test samples. Taking LISUN SQ-010 sulfur dioxide test chamber as the research object, this paper elaborates the working principle, core technology, applicable standards and engineering application of the sulfur dioxide test chamber. Combined with measured technical data, it verifies the stability and practicability of the equipment in industrial corrosion detection, and provides technical reference for material selection, product protection design and quality verification.

1 Introduction
In modern industrial sectors including metallurgy, chemical engineering, electric power and transportation, exhaust sulfur dioxide reacts with atmospheric moisture and generates sulfurous acid and sulfuric acid. These acidic substances cause persistent corrosion on metal components, electronic connectors, hardware accessories and coated products, resulting in shortened service life, structural damage and potential safety hazards. Traditional natural exposure corrosion tests feature long cycle and uncontrollable external conditions, failing to meet the demands of rapid R&D and quality supervision.

The sulfur dioxide test chamber builds artificial sulfur corrosion environment with controllable parameters, compressing natural corrosion process lasting several years into days or weeks, which greatly improves detection efficiency and data comparability. As core equipment of sulfur dioxide test chamber, LISUN SQ-010 sulfur dioxide test chamber adopts high-precision gas control and temperature coordination regulation technology, complying with domestic and international mainstream corrosion test standards. It can steadily reproduce industrial sulfur corrosion conditions, and act as a standardized and repeatable testing platform to verify anti-corrosion capacity of metal materials, surface plating, coatings and finished products, becoming essential infrastructure for industrial quality control and reliability research.

2 Corrosion Mechanism and Core Functions of Sulfur Dioxide Test Chamber

2.1 Sulfur Dioxide Corrosion Mechanism
Sulfur dioxide corrosion belongs to electrochemical corrosion mediated by acidic electrolyte. Dissolved SO₂ on material surface water film generates sulfurous acid, which will be further oxidized into sulfuric acid. The pH value of surface electrolyte drops to 2-4, destroying passive film on metal surface. Micro galvanic cell forms with metal dissolution occurring at anode and redox reaction happening at cathode. This reaction accelerates pitting corrosion, intergranular corrosion and coating peeling, exposing hidden protection defects and structural weaknesses of samples in a short period.

2.2 Core Functions
First, it realizes accurate simulation of industrial corrosion environment by stably adjusting sulfur dioxide concentration, temperature and humidity to restore typical corrosive scenes. Second, coupled high-concentration gas and temperature conditions accelerate corrosion reaction to rapidly assess corrosion resistance. Third, various failure phenomena such as coating blistering, plating shedding and matrix rust can be clearly observed for defect positioning and structural optimization. Fourth, the equipment conforms to multiple international and domestic standards, supporting authoritative certification and inspection. Fifth, whole-process parameter recording ensures repeatable tests and comparable experimental results.

3 Technical Characteristics of LISUN SQ-010 Sulfur Dioxide Test Chamber
LISUN SQ-010 is a mainstream model applied in sulfur dioxide test chamber, designed for medium and large-sized samples and batch detection. It presents outstanding performance in sealing property, control precision and operational stability. The internal chamber is integrally formed by imported anti-corrosion PP plate without welding gaps, effectively preventing gas leakage and equipment erosion. Equipped with U-shaped titanium alloy heating tubes, the system achieves fast heating and uniform internal temperature distribution. The intelligent control system supports automatic gas supply, real-time data monitoring and cyclic operation modes, minimizing manual operation. Multiple protective designs including overload protection and waste gas treatment guarantee safe and eco-friendly test operation.

Sulfur Dioxide Test Chamber SQ 010 AL

4 Key Performance Parameters of LISUN Sulfur Dioxide Test Chamber
Table 1 Specification Parameters of LISUN SQ Series Sulfur Dioxide Test Chamber

5 Applicable Standard System for Sulfur Dioxide Test Chamber
All test procedures and judgment criteria conducted in sulfur dioxide test chamber strictly comply with recognized standards to ensure universal validity of experimental data. LISUN SQ-010 sulfur dioxide test chamber supports a complete set of standards.
• National standards: GB/T 2423.19-2013, GB/T 2423.20-2014, GB/T 2423.33-2005, GB/T 9789-2008, GB/T 5938-2017, GB 25972-2010
• International standards: IEC 60068-2-42:2013, IEC 60068-2-43:2013, ISO 6988:1985, DIN 50018:2017, ASTM G87-2015, ASTM B845-2020

Parameters including gas concentration, temperature and test duration vary among different standards. Operators shall select corresponding specifications according to practical application and certification requirements.

6 Practical Application of Sulfur Dioxide Test Chamber
In material research, the chamber compares corrosion rate of carbon steel, stainless steel, aluminum alloy and copper alloy to optimize base material selection. For surface treatment evaluation, it detects protective effect and service life of galvanization, nickel plating, paint coating and anti-corrosion coating. In electrical and electronic industry, it verifies contact stability and insulation performance of connectors, circuit boards and relays under sulfur corrosion environment. It also conducts durability inspection on building hardware, fasteners and rail vehicle components. Besides, the equipment serves as formal inspection and certification testing equipment, helping enterprises meet market access requirements.

7 Operational Advantages and Application Value
The sulfur dioxide test chamber remarkably shortens test cycle and accelerates product upgrading process. Stable internal environment eliminates interference from natural climate, delivering highly credible and repeatable test results. It cuts investment on outdoor exposure field and long-term sample maintenance, reducing overall testing cost. Potential corrosion risks can be detected in early research stage to avoid mass product failure and economic loss. Meanwhile, standard-compliant test results facilitate product certification and global market expansion.

8 Conclusion and Prospect
Equipped with LISUN SQ-010 sulfur dioxide test chamber, the sulfur dioxide test chamber realizes accurate simulation of industrial sulfur corrosion environment, achieving accelerated performance assessment and defect inspection on metal materials, surface coatings and finished products. Featuring anti-corrosion structure, precise parameter control and wide standard compatibility, the equipment provides reliable testing solutions for material development, product inspection and quality certification.

With the upgrading of industrial manufacturing, higher requirements are put forward on material anti-corrosion performance. Future sulfur dioxide test chamber will develop towards multi-factor coupled corrosion simulation, online real-time performance monitoring, intelligent data analysis and automatic sample handling. Continuous technical improvement will enhance simulation authenticity and detection accuracy, supporting the development of long-life and high-reliability industrial products.