T/CSAE 68-2018 in English

VALID

The accelerate corrosion test method of the car body in the test cabin

Issued on:2018-03-01
Implemented on:2018-03-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $300.00
$291.00

Standard No:	T/CSAE 68-2018
Document status:	VALID
Title in English:	The accelerate corrosion test method of the car body in the test cabin
Title in Chinese:	乘用车车身试验舱加速腐蚀试验方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2018-03-01
Implemented on:	2018-03-01
Professional Classification:	T/-Social Organization Standard
Related Keywords:	accelerate corrosion test method test vehicle body three-stage cycle test method corrosion level wet conditions body corrosion intensity quantification
Related Topics:	Self-corrosion potential test method Corrosion test time body passenger car Buried Inspection Corrosion Rate Test Method Corrosion Test Method test chamber accelerated corrosion Accelerated Corrosion Test Corrosion Test Method at corrosion rate Acceleration test failed Accelerated version test acceleration Corrosion Test Parameters Test method for plastic corrosion Corrosion test equipment test Corrosion test Accelerated corrosion test method for passenger car body test chamber Microbiological Corrosion Test Methods International Advantages and Disadvantages of Artificially Accelerated Corrosion Test Methods electrically accelerated corrosion Passenger car loading quality Soil corrosion accelerated test method Ethylene glycol internal corrosion accelerated test Mobile shelter testing method t/csae 312 t/csae 133 Soil Corrosivity Test Methods Electrolytic accelerated corrosion test

Introduction

Analysis of the core content of the standard

This standard specifies the entire process of accelerated corrosion testing of passenger car bodies in a test chamber environment, including a three-stage cycle test method of neutral salt spray, standard climate, and constant temperature and humidity. By simulating harsh environmental conditions, the corrosion effect evaluation equivalent to 3-5 years of natural exposure can be completed within 28 days.

Comparison of key technical parameters

Test phase	Temperature (℃)	Relative humidity (%)	Duration (h)	Core indicators
Neutral salt spray	35±2	-	4	Salt spray deposition rate (5±1)ml/(80cm²·h)
Standard climate	23±2	50±5	4	ISO 554-23/50 standard
Constant temperature and humidity	40±2	>95	16	Non-condensing mode

Key requirements for test equipment

The test chamber needs to be equipped with a salt spray system, a temperature and humidity control system and a pure water preparation system. The main technical indicators are:

Salt spray nozzle is made of corrosion-resistant material and is equipped with more than 20 collection devices
Compressed air pressure is adjustable from 70 to 170 kPa, and the oil content is ≤0.1 mg/m³
Pure water conductivity is <5μS/cm
The cabin volume must ensure that the distance between the vehicle body and the wall is ≥30cm, and the distance between the vehicle body and the top is ≥50cm

Key points for standard implementation

1. Sample preparation

The test vehicle body should complete all painting processes, install key components such as door waterproof membrane, sealing strips, and be scribed according to ISO 17872.

2. Corrosion intensity monitoring

The mass loss of the SAE 1008-1010 standard plate is measured every 7 cycles, and the corrosion loss of the 48-hour neutral salt spray test is required to be 70±20g/m².

3. Abnormal handling process

When the equipment fails, it must be immediately switched to the standard climate state (23±2℃, 50±5%RH). If the interruption exceeds 4 hours, the test cycle must be restarted.

Technology Evolution Analysis

Compared with QC/T 732 standard, this method innovatively adopts:

Three-stage cyclic corrosion: More accurately simulates the real environment of alternating dry and wet conditions
Body corrosion intensity quantification: Data comparability achieved through standard plates
Inner cavity corrosion assessment: Disassembly and inspection of hidden parts such as A/B/C pillars are required

Typical application cases

A domestic brand car model was found through this test:

Electrophoretic blind area appeared in the inner cavity of the door sill after 18 cycles (film thickness <15μm)
Solution: Optimize the swing frequency of the electrophoresis tank to 2Hz
After the improvement, the corrosion level of the 28-cycle test was reduced from level 4 to level 1

More samples: JJG 21-2008 GB 18306-2015 DL/T 5154-2012

Sample only — not a preview of T/CSAE 68-2018

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