CB 1146.12-1996 Marine Equipment Environmental Testing and Engineering Guidelines Salt Spray CB1146.12-1996 Standard Download Decompression Password: www.bzxz.net

Department Standard of China State Shipbuilding Corporation
CB1146.11146.18--96
Environmental Test and Engineering Guidelines for Ship Equipment
199612-23 Issued
China State Shipbuilding Corporation
Implementation on 1997-06-01
1 Subject Content and Scope of Application
Department Standard of China State Shipbuilding Corporation
Environmental Test and Engineering Guidelines for Ship Equipment
CB1146.12-96
Replaces CB1146.12-85
Classification Number: U08
This standard specifies the test conditions, severity levels, test procedures, test interruption handling, and qualification criteria for salt spray tests on components, materials and their protective layers of ship equipment, and provides relevant engineering guidelines. This standard is applicable to the assessment of the salt spray corrosion resistance of equipment, components, materials and protective layers exposed to atmospheric conditions and the evaluation of the quality and uniformity of metal protective layers.
This standard is not suitable as a general corrosion test method. 2 Referenced documents
CB1146.1-96 Marine Equipment Environmental Test and Engineering Guidelines General 3 Test conditions
3.1 Test chamber (room) requirements
3.1.1 The materials used in the test chamber (room) should be resistant to salt spray corrosion and should not affect the test results. 3.1.2 The test chamber (room) should be able to provide the conditions specified in this standard. 3.1.3 The droplets gathered inside the test chamber shall not fall on the test sample. 3.1.4 Salt spray shall not be sprayed directly onto the test sample. 3.1.5 The air pressure inside and outside the test equipment must be balanced. 3.1.6 The sprayer should be resistant to salt liquid corrosion and be able to produce fine, lubricated and evenly distributed fine mist. 3.2 Concentration of salt solution
The salt solution is made of sodium chloride (chemically pure or above) and distilled water or deionized water with a resistivity of not less than 500Q·m. Use 5 parts of sodium chloride and 95 parts of water by mass, and mix them thoroughly to make a salt solution with a sodium fluoride content of 5±1%. The sprayed salt solution shall not be reused.
3.3 PH value of salt solution
When the temperature of each prepared salt solution is 35±2C, the pH value of the collected liquid after spraying should be 6.5~7.2. It is allowed to adjust the pH value with chemically pure hydrochloric acid or sodium hydroxide aqueous solution, but the concentration should still comply with the provisions of Article 3.2. 3.4 Salt spray deposition rate
Use a clean collector with an area of ​​80cm\ to collect the salt spray that settles after continuous spraying for 16h. The salt spray deposition rate at any position in the effective space should be 1~2ml/h·80cm2.
3.5 Test temperature
The temperature in the effective test space should be 35±2℃. 3.6 Spray method
Use continuous spray. When atomizing, it is necessary to prevent impurities such as oil, dust and the temperature and humidity of the sprayed air from affecting the test conditions in the effective space. China State Shipbuilding Corporation approved 74 on December 23, 1996
Implementation on June 1, 1997
4 Severity level
CB1146.12-96
When the test conditions are determined, the severity level of the salt spray test is generally distinguished by the test time. Unless otherwise specified in the product standard or technical documents, this standard recommends the test time as: 48h, 96h, 144h. 5 Test procedure
5.1 Pretreatment
Determine whether cleaning is required according to the product standard, but it must be ensured that the surface of the test product is clean, free of oil, temporary protective layer and other defects.
If the product standard requires cleaning treatment, use a solvent that does not produce corrosion or protective film to remove dirt or temporary protective layers on the surface of the test piece. Organic coatings should not be cleaned with organic solvents. End faces and contact surfaces that do not require coatings should be coated with wax or other similar substances for protection.
5.2 Initial test
Before the test, conduct an appearance inspection of the test piece. If it is a complete machine, conduct an appearance inspection and performance test in accordance with the product standards or technical documents. 5.3 Test placement
The complete machine test piece should be placed in the test box (room) according to the actual use status or the relevant standards and technical documents. The flat test piece should make the test surface at an angle of 1530° to the vertical direction. The test pieces should not touch each other, and the distance between them should not affect the free sedimentation of salt spray. The salt solution on the entire test piece should not drip onto other test pieces.
5.4 Condition test
5.4.1 The test piece shall be tested in accordance with the provisions of Chapter 3. Adjust the temperature to 35C and start spraying. 5.4.2 If the test piece is a complete machine and preheating is required, the test piece temperature must be stable for at least 2 hours before spraying. 5.4.3 The salt spray deposition rate and pH value should be tested once every 24 hours (or 12) for continuous spraying. If the deposition rate does not meet the requirements of Article 3.4, the test during this period should be handled in accordance with the provisions of test interruption treatment in Chapter 6. 5.5 Recovery
After the test, the product recovery shall be carried out in accordance with the following provisions: a. If the test piece is a sample or component, gently wash off the salt deposits on the surface of the test piece with running water, then rinse in distilled water, and the washing water temperature shall not exceed 35°C, and then recover for 1 to 2 hours under normal atmospheric conditions, or recover according to other recovery conditions and time specified in the product standard.
b. If the test piece is a complete machine, place it under the standard atmospheric conditions of the test for 48 hours or recover and dry it according to the product standard or technical documents. 5.6 Final test
After recovery, make an appearance inspection of the test pieces of components, materials and protective layers, and perform performance inspection of the whole machine according to the requirements of product standards. 6 Test interruption handling
6.1 Undertest interruption
When the test conditions are lower than the lower limit of tolerance, the test situation should be judged. After a comprehensive visual inspection of the test piece, if it is considered that it can be continued, the test will be continued if the test conditions meet the specified requirements. The test time before the interruption point that is lower than the lower limit of the test condition tolerance is valid. The test time will be continued from the interruption point. 6.2 Overtest interruption
When the test conditions exceed the upper limit of tolerance, the test should be interrupted. After a comprehensive visual inspection of the test piece, if it is considered that it will not have an adverse effect on the final test results or can be repaired in time, the test will be continued if the test conditions meet the specified requirements. The test time before the interruption point that is higher than the upper limit of the test conditions is valid. The test time will be continued from the interruption point. If it is impossible to make a judgment on the final test results, the test needs to be repeated with a new test sample.
7 Qualification criteria
CB 1146. 1296
The evaluation of metal protective layer shall be carried out according to the provisions of Table 1 and Table 2, or according to the provisions of product standards and technical documents. Naval vessel equipment
Base metal
Copper alloy
Base metal
Copper alloy
Copper nickel chromium
Anodizing
Copper nickel chromium
Anodizing
Post-treatment
Post-treatment
General equipment
Test time
Ship equipment
Test time
Qualification requirements
No white or black corrosion on the surfacewww.bzxz.net
No white or black corrosion on the surface
No brown rust corrosion on the surface
No gray or light green corrosion on the surface
No light green corrosion on the surface
No patina on the surface
No patina on the surface
No cancerous corrosion spots
Specification requirements
Explosion-proof equipment, outdoor equipment
No white or black corrosion on the main surfaceNo white or black corrosion on the main surfaceNo brown rust corrosion on the main surface
The whole machine assessment shall be carried out in accordance with the product standards and technical documents. 7.2
Test records and documents
The preparation of test documents shall comply with the relevant provisions of Chapter 8 of CB1146.1. 9 Engineering Guidelines
The engineering guidelines are shown in Appendix A (reference).
10 Details to be specified when citing this standard
a. Pretreatment conditions;
No gray or light green corrosion on the main surfaceNo light green corrosion on the main surface
No copper edge on the main surface
No patina on the main surface
No corrosion spots on the main surface
b. Test items and requirements;
c. Sample placement status;
d. Test time and precautions;
e. Recovery and drying time;
f. Qualification criteria.
CB1146.12-96
A1 Introduction
CB1146.1296
Appendix A
Guidelines for Salt Spray Environmental Test Engineering for Ship Equipment (reference)
This standard is applicable to the assessment of the salt spray corrosion resistance of ship equipment materials and their protective layers, and the evaluation of the quality and uniformity of metal protective layers.
This standard is also applicable to the assessment of the salt spray resistance of ship equipment and the impact of salt spray corrosion on performance and use. A2 Environmental Effects
The effects of materials exposed to water-containing salt spray atmospheric environment are roughly divided into three categories: corrosion effects, electrical effects and physical effects. A2.1 Tumor Chain Effect
a. Corrosion caused by electrochemical reaction;
b. Accelerated stress corrosion;
c. Corrosion caused by acid and alkali solutions formed by the ionization of salt in water. A2.2 Electrical Effects
a. Salt deposition damages electronic equipment;
b. Produces a conductive layer;
c. Corrosion of insulating materials and metals.
A2.3 Physical effects
a. The moving parts of mechanical parts and assemblies are blocked or stuck. b. The paint layer is bubbling due to electrolysis. A3 Test sequence
The salt spray test procedure has a potential damaging effect on the material, so the salt spray test should be carried out after other climate tests, especially after the mold and damp heat tests.
A4 Severity level selection
The whole machine test shall not be less than 48 hours. Considering the quality requirements of the electroplating layer of electrical and electronic products, the test time of the commonly used coating is 48 hours, 96 hours, and 144 hours. For this reason, this standard recommends these three test times. A5 Principles for selecting electroplating layers
A5.1 The protective coating of steel parts can be galvanized or plated, and passivation treatment is required after electroplating. A5.2 Galvanizing is more suitable for protection against industrial atmospheres, and plating is more suitable for protection against humid atmospheres or marine atmospheres. A5.3 Galvanized or cadmium-plated parts will also be corroded if they are in contact with the gas emitted by organic substances such as plastics and paints for a long time in a humid and poorly ventilated space. Products with special requirements should be coated with a layer of varnish or neutral grease to improve the corrosion resistance of the coating. A5.4 Steel springs should be treated with hydrogen after zinc or cadmium plating. A5.5 The protective decorative coating of steel parts can be steel + ten nickel ten chromium, or low tin bronze (containing 10%~15% saw) ten chromium. 78
Additional remarks:
CB1146.12-96
This standard was proposed by the 603rd Institute of China State Shipbuilding Corporation. This standard is under the jurisdiction of the Marine Environmental Conditions Group. This standard was drafted by the Standardization Research Office of the Seventh Institute of China State Shipbuilding Corporation. The main drafter of this standard: Wan Mingqi.
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