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Pre-paint treatment Product List

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PPC service

PPC service

Because we have done the painting! We can meet all quality, performance, and budget requirements.

"PPC" refers to a service that means Peeling, Paint, and Cleaning. We offer proposals for pretreatment and paint stripping. In pretreatment, we perform zinc phosphate treatment in barrels, accommodating mass production of iron products in palm-sized units, ranging from 1,000 to 10,000 pieces. We contribute to addressing challenges such as searching for subcontractors due to the lack of in-house facilities. For stripping, we carry out chemical treatment with ultrasound and stripping solution, heating treatment with micro-heaters, and polishing treatment with blast equipment. This removes paint accumulated on in-house jigs, leading to cost reduction. Please feel free to contact us when you need our services. 【Processing Methods】 ■ Zinc phosphate treatment in barrels ■ Chemical treatment with ultrasound and stripping solution ■ Heating treatment with micro-heaters ■ Polishing treatment with blast equipment *For more details, please download the PDF or feel free to contact us.

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  • Surface treatment contract service
  • Pre-paint treatment

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The SUS coating was hindered by the "passivation film" from adhering properly.

The SUS coating was hindered by the "passivation film" from adhering properly.

Explanation of measures against poor adhesion and peeling due to the unique passive film of stainless steel.

Stainless steel has high corrosion resistance, but it is a material that is difficult for paint to adhere to. There are cases where the passive film on the surface repels the coating. Sandblasting or a special primer may be required. Pre-treatment specifically for stainless steel is important. We also provide detailed examples of improvements in publicly available materials.

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Aluminum die casting coating's pre-treatment was everything for quality.

Aluminum die casting coating's pre-treatment was everything for quality.

The quality of the pre-treatment greatly affects adhesion. What processes should be checked before the paint and equipment?

In aluminum die casting painting, it is not an exaggeration to say that the pre-treatment determines the quality. No matter how high-performance the paint used is, if the pre-treatment is insufficient, it can lead to poor adhesion and paint film peeling. One often overlooked factor is the specific contaminants of the material. Aluminum die casting tends to retain release agents and processing oils, and if painting is done without adequate degreasing, the paint film will not adhere properly. Additionally, the oxide film can also cause a decrease in adhesion. Furthermore, in baked coatings, heating to around 180°C can cause internal gases to expand, potentially leading to blisters and pinholes. Therefore, gas countermeasures during the pre-treatment stage are also important. On-site, there is often a tendency to focus solely on the painting process, but many issues arise before painting. By properly performing degreasing, surface adjustment, and chemical treatment, adhesion and durability can be improved. To stabilize quality, it is necessary to manage not only the painting conditions but the entire pre-treatment process. We have published materials summarizing cases where improvements were made by reviewing the pre-treatment process. If you have similar challenges, please refer to them.

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Three points for pre-treatment to prevent poor adhesion of aluminum die-cast coating.

Three points for pre-treatment to prevent poor adhesion of aluminum die-cast coating.

Peeling of aluminum die-cast paint occurs due to insufficient management of oil content, voids, and surface conditions.

■Cause of Occurrence: Poor adhesion of aluminum die casting is judged to be weak and easily peeling paint. The causes are not only the paint itself but also the residual oil from casting and processing, the presence of pores and gas escape on the material surface, and the surface condition after pretreatment. It is a material that tends to retain dirt and moisture in complex shapes, particularly around holes, corners, and ribs. ■Truth: It is difficult to detect at the time of shipment, and if oil or moisture remains under the paint film, it will peel off due to assembly or transport vibrations. In areas with pores, it can develop into pinholes or blisters. The quality of the paint is almost determined by the management before application. ■Improvement Measures: By confirming the three points of degreasing to remove oil, ensuring no moisture remains after cleaning, and checking for pores and roughness at each process, it can be recorded in the lot records to prevent recurrence. Please utilize materials that can confirm pretreatment, material condition, and film thickness conditions.

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  • Pre-paint treatment

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In an era where the adoption of aluminum parts is advancing, the concept of substrate management to prevent paint peeling.

In an era where the adoption of aluminum parts is advancing, the concept of substrate management to prevent paint peeling.

In the lightweight automotive parts, the adhesion of aluminum coatings and the management of pre-treatment become important.

■Cause of Occurrence: The importance of aluminum parts is increasing due to trends in weight reduction and cost management. Aluminum is lightweight and has excellent workability, but if painted with the same approach as iron, issues such as poor adhesion, paint peeling, pinholes, and blisters can occur. The three points to check are the residue of processing oil, the condition of the oxide film, and the drying after pretreatment. ■Truth: Peeling is not just a matter of paint selection. With weight reduction, shapes have become more complex, increasing ribs, holes, corners, and thin sections, making it easier for cleaning agents and moisture to remain. Even if the surface is clean at the time of shipment, peeling can become apparent during assembly or storage. ■Improvement Measures: Treat aluminum as a material where quality differences arise during pretreatment, managing degreasing, surface adjustment, and drying with numerical records. In the event of peeling, revert to check the pretreatment, film thickness, and curing conditions of the same lot. Please utilize documents that allow you to verify pretreatment, drying, and film thickness conditions.

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Change the surface to one that allows paint to "adhere" | Pre-treatment for painting using atmospheric pressure plasma.

Change the surface to one that allows paint to "adhere" | Pre-treatment for painting using atmospheric pressure plasma.

Atmospheric pressure plasma pre-treatment for coating

To maximize the performance of coatings, surface preparation (surface modification) is essential. Our atmospheric pressure plasma equipment modifies the surface of materials in a non-contact manner at atmospheric pressure, significantly improving the adhesion, durability, and uniformity of coatings. It accommodates a wide range of materials, including resins, metals, glass, and ceramics, and realizes surface preparation that allows coatings to exhibit their inherent performance without the use of chemicals and in a non-contact manner. *The effectiveness may vary depending on the compatibility with the material and coating. To confirm the optimal effects for your products and processing targets, we conduct preliminary tests. Upon request, we can also provide on-site testing at our lab or rental services for test equipment. Please verify the reliable effects of atmospheric pressure plasma at your location.

  • Plasma surface treatment equipment
  • Pre-paint treatment

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Chromate treatment (pre-treatment for painting) .com @ Eiwa Kogei Co., Ltd.

Chromate treatment (pre-treatment for painting) .com @ Eiwa Kogei Co., Ltd.

Pre-treatment for painting aluminum (aluminum die casting) and zinc die casting, which are difficult for paint to adhere to.

When high quality and adhesion are required for the painting of aluminum (die-cast) and zinc die-cast products, we adopt "chromate treatment," which is a pre-treatment for painting aluminum (zinc). By applying "chromate treatment" to aluminum materials and zinc die-cast products, which are considered difficult for paint to adhere to, we can impart "high adhesion" and "high corrosion resistance." These non-ferrous metal materials often encounter adhesion issues during painting. It is necessary to align the required quality and painting specifications during the design phase of the painting process.

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How to prevent paint peeling? All about adhesion.

How to prevent paint peeling? All about adhesion.

Preprocessing is everything about adhesion.

This explains the key points for improving poor adhesion, insufficient pre-treatment, degreasing, and drying conditions that can cause paint to peel. The reasons for peeling occurring some time after painting are not only due to insufficient pre-treatment but also due to trace amounts of moisture and oxidation films. Adhesion can vary significantly depending on humidity and the condition of the materials. It is important to understand the reasons why results differ even with the same process and to review the process accordingly. Poor painting cannot be improved with vague measures. Our company has published case study materials on improvements. Please take a look.

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Dop plating was causing delamination due to "surface reactions."

Dop plating was causing delamination due to "surface reactions."

Explaining paint peeling due to surface reactions of molten zinc coating and countermeasures.

Hot-dip galvanized steel is a material that is difficult for paint to adhere to. It has a very smooth surface, making it challenging for the paint film to stick. There may be cases where sweep blasting or specialized surface treatment is necessary. Designing specialized processes is important. We also provide detailed examples of improvements in publicly available materials.

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Insufficient cleaning is the cause of all painting defects and the truth behind recontamination.

Insufficient cleaning is the cause of all painting defects and the truth behind recontamination.

Post-cleaning environmental management is important.

【Problem】Residual oil and contaminants left on the surface due to insufficient cleaning cause poor adhesion. 【Cause】Recontamination occurs due to leaving the surface after degreasing / Dust and oil from the environment adhere / Insufficient cleaning does not provide a fundamental solution / If drying is inadequate, moisture remains. 【Management Standards】It is recommended to paint immediately after cleaning and to minimize the waiting time. 【Improvement Example】By strictly managing the cleaning process, defects caused by recontamination are reduced.

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