Why do salt spray test for pre-treatment of powder coating equipment?

In recent years, metal surface treatment technology has developed rapidly and has been widely used in many fields.

In the surface treatment technology and engineering of powder coating equipment, pre-treatment occupies a very important position. It is not only indispensable as a “pre-treatment process” before surface treatment, but also closely related to the success or failure of subsequent surface treatment.

Therefore, it is necessary to eliminate various oil stains (such as lubricating oil, emulsion, grease, sweat, and dust) on the surface of the coated object before painting, and the cleaning process of making the coated surface clean is an indispensable process of pre-coating treatment process; What kind of chemical treatment or mechanical processing is carried out on the clean coated surface depends on the substrate and surface condition of the coated object and the coating process requirements.

The purpose of the salt spray test is to assess the corrosion resistance of the product or metal material against salt spray corrosion.

So what effect does the pretreatment process have on the salt spray test of the product?

The following Ninh Bình DHA takes you to understand!

Salt spray test is generally divided into four types: neutral salt spray test (NNS test), acetate salt spray test (ASS test), copper salt accelerated acetate salt spray test (CASS test) and alternating salt spray test.

Usually we use the neutral salt spray test, which is the earliest and the most widely used test method for accelerated corrosion.

It uses 5% sodium chloride salt water solution, and the PH value of the solution is adjusted to the neutral range (6-7) as the spray solution.

The test temperature is 35 ℃, and the sedimentation rate of salt spray is required to be between 1-2ml/80cm2.h!

The simplest and fastest method can be used: salt spray corrosion test chamber.

Spray in the box to simulate the accelerated corrosion method of seawater environment, and the length of its withstand time determines the quality of the corrosion resistance!

Classification of salt spray test time of powder coating equipment:


Within 300h-(processing methods such as degreasing, washing and drying, such as file cabinets, switch cabinets and anti-theft doors, etc.) within 300h-700h-(passive pickling and silane treatment can be used, such as the production of zinc steel guardrail factory)

Within 700h-1000h-(Electrophoresis + dusting / painting can be used, such as construction machinery and automotive exterior parts, etc.)

With the rapid development of my country’s economy, the improvement of living standards and the enhancement of environmental protection awareness, customers have also put forward higher requirements for the products of plastic injection equipment itself.

Faced with the diversification of today’s market inspection methods, more companies are faced with a more complex situation. However, Ninh Bình DHA uses its unique plastic spraying process and uses the latest fourth-generation intelligent powder spray gun to form powder. Dense phase conveying reduces the flow velocity of the powder, making it easier for the powder to form a soft mist, effectively overcoming the Faraday cage effect, and thus uniformly adsorbed to the surface of the sprayed workpiece, ensuring a high powder rate on the workpiece and no groove bottom, effectively eliminating The poor corrosion resistance of the powder due to the thin coating is fundamental!

For a long time, Ninh Bình DHA always believes that the quality of enterprise management is ultimately reflected in the quality of products or services.

Because only efforts to improve the quality of products can meet the requirements of continuous development of society and market competition, and enhance the viability of enterprises. So, how to fundamentally improve the quality of products? The most important point is to strengthen the source of quality and control the occurrence of various quality problems.

Thank you for your interest in Ninh Binh DHA Joint Stock Company.

Office: NO16 – LK573, Gieng Sen area, La Khe ward, Ha Dong dist, Hanoi city, Vietnam

Factory: Lot 22, Khanh Phu industrial zone, Ninh Binh Province, Vietnam

Tel:  +84 936299611

Email: sales@hanexmetal.com

Leave a Reply

Your email address will not be published. Required fields are marked *