One of the characteristics of a hydraulic valve that manufacturers and resellers search for is durability. That is a given since hydraulic valves are subjected to harsh conditions. This is why tests are conducted to test the valve’s strength and one of these tests is the Salt Spray test.
What is a Salt Spray Test?
The salt spray test is used to determine the corrosion resistance of a metal or the metal surface of a hydraulic valve after electroplating and is carried out in an experiment box. The corrosion test can be carried out by spraying a corrosive salt solution.
Another way to do this can also be carried out by corrosive gas. Different corrosion methods are adopted according to the specific use environment.
There is a set of test standards and test ratings when you conduct a salt spray test. There are four methods to determine the corrosion of salt spray test.
These are the rating judgment method, weighing judgment method, corrosion occurrence judgment method, and corrosion data statistical analysis method.
The statistical analysis method of corrosion data provides a method for designing corrosion tests which also provides a medium to analyze corrosion data and determine the confidence level of corrosion data. It is mainly used for analyzing and counting the corrosion situation, rather than judging the quality of a specific product.
Why Do Hydraulic Valves Need to Undergo A Salt Spray Test?
Here are six reasons HFD Hydraulic did a salt spray test on their hydraulic valve.
Corrosion Resistance
Hydraulic valves are often used in environments in their applications. They are constantly exposed to moisture, chemicals, and salt. The salt spray test helps determine if the valve’s materials and coatings can resist corrosion over time.
Safety and Reliability
Corrosion can weaken hydraulic valves. This leads to leaks or failure, which can compromise the safety and efficiency of hydraulic systems. Testing ensures that the valves will function reliably in harsh conditions.
Longevity
By identifying potential corrosion issues early, manufacturers can improve the materials and coatings used in hydraulic valves. In turn, this helps in extending their lifespan and reducing maintenance costs.
Quality Assurance
Conducting salt spray tests is part of a comprehensive quality control process. It ensures the valves meet industry standards and regulatory requirements for performance in corrosive environments.
Customer Satisfaction
Demonstrating that hydraulic valves can withstand rigorous testing and perform reliably in corrosive environments helps build customer trust and confidence in the product.
Tolerance to Extreme Conditions
Hydraulic systems are often critical in heavy machinery, aerospace, automotive, and other industries. Ensuring that valves can withstand extreme conditions is crucial for the overall performance and safety of these systems.
How does HFD Hydraulic Grade its Salt Spray Test?
The salt spray test standard is divided into ten levels, which are based on the HFD Hydraulic test standard and conform to the actual situation.
The specific classification and phenomenon of the salt spray test standard are as follows.
| Grade | Description |
| Grade 10 | no defective area, A for appearance rating since there are no changes in the appearance of the sample surface |
| Grade 9 | the areas of defect area do not exceed 0.1% of the surface, with appearance rating B, and the surface of the sample has slight to moderate discoloration |
| Grade 8 | the proportion of defect area is between 0.1% and 0.25%, the appearance rating is C, and the surface of the sample is seriously allochroic or has very slight corrosion |
| Grade 7 | the defect area accounts for 0.25% ~ 0.5%, appearance rating D, and the surface of the sample has serious light loss and very slight corrosion products |
| Grade 6 | the defect area accounts for 0.5% ~ 1.0%, appearance rating E, the surface of the sample loses light seriously, or there is a thin layer of corrosion products or pitting corrosion on the local surface of the sample |
| Grade 5 | Defected areas appear for 1.00% – 2.50% of the metal surface, given an appearance rating of F. The sample surface has corrosion signs that are distributed to the whole surface. |
| Grade 4 | There are 2.5% – 5% defected areas which give an appearance rating of G. Thick corrosion product layer on the sample of the metal surface |
| Grade 3 | the defect area accounts for 5% ~ 10%, appearance rating H, and there is a very thick corrosion product layer or pitting corrosion on the surface of the sample, and there is deep pitting corrosion |
| Grade 2 | the defect area accounts for 10% ~25%, appearance rating I, and the sample has the phenomenon of base metal corrosion |
| Grade 1 | the defect area accounts for 25% ~50%, which is a serious corrosion phenomenon |
Talk to HFD Experts About Quality-Tested Hydraulic Valves
HFD Hydraulic is known to make quality hydraulic valves at affordable prices compared to our counterparts.
If you wish to know how durable our valves are, you can speak to our experts. Send them an inquiry here.
