In the metal processing and surface treatment industry, salt spray corrosion has always been the "number one killer" that plagues many enterprises. Especially for electroplated workpieces, although galvanizing, nickel plating, chrome plating and other processes can provide certain protection capabilities, in the harsh environment of high humidity, high salt content and high temperature, the surface of the coating is prone to white rust, red rust or oxidation spots, resulting in damaged product appearance, shortened service life, and even causing customer complaints and bulk returns. How to make electroplated workpieces pass the customs easily in the salt spray test? How to keep them as clean as new during storage and transportation? Hank BS-405 electroplating anti-rust oil gives a hard core answer - 150 hours of neutral salt spray test without rust!
Salt spray test: a "touchstone" for measuring rust resistance
In the industrial field, the neutral salt spray test (NSS) is the most commonly used accelerated test method to evaluate the corrosion resistance of metal materials and their coatings. During the test, the sample is placed in a 5% sodium chloride brine spray environment at a constant temperature of 35 ° C, and the corrosion conditions of the marine atmosphere or industrial atmosphere are simulated by continuous spraying. The longer the corrosion products (such as white rust, red rust) begin to appear on the surface of the sample, the stronger its corrosion resistance.
For conventional anti-rust oil products, the neutral salt spray time often stays between 24 and 72 hours. And Hank BS-405 electroplating anti-rust oil has increased this data to more than 150 hours with its unique formula design, which is equivalent to 2 to 3 times the performance of ordinary anti-rust oil. This means that the electroplated workpieces treated with BS-405 can be easily stored indoors for more than 6 months without shelter, and can also show excellent stability in outdoor short-term protection.
Why did the Hank BS-405 break through the 150-hour mark?
The anti-rust mechanism of anti-rust oil depends on whether a continuous, dense, and thick protective film can be formed on the metal surface, and at the same time, it must have good replacement and permeability. Hank BS-405 electroplating anti-rust oil has achieved a performance leap in three aspects:
1. Selected high-performance base oils and composite rust inhibitors
BS-405 uses deeply refined low-viscosity mineral oil as base oil, combined with a variety of high-efficiency oil-soluble corrosion inhibitors, sulfonate rust inhibitors and special polymer film-forming agents. After these components are divided into membranes, a molecular-level directional protective layer can be formed on the surface of the electroplating layer. Polar groups are firmly adsorbed on the metal surface, and non-polar groups form a hydrophobic barrier outward to effectively isolate the penetration of water vapor, oxygen and chloride ions.
2. Optimize the formula for the characteristics of the electroplating layer
There are often tiny pores and grain boundary defects on the surface of electroplated coatings (e.g. galvanized coatings, nickel coatings), and corrosion media can easily invade from these weak links. BS-405 deliberately adds highly permeable active ingredients, which can quickly penetrate into the micropores of the coating, forming a secondary protective layer inside the coating and at the coating/substrate interface, significantly delaying the formation of corrosive cells. This is also why BS-405 performs particularly well on galvanized workpieces - not only to prevent white rust, but also to prevent red rust from spreading to the substrate.
3. Excellent drainage and displacement
After cleaning and passivation of electroplated workpieces, trace moisture or acid, alkali and salt substances often remain on the surface. If the anti-rust oil cannot effectively replace this moisture, the anti-rust effect will be greatly reduced. Hank BS-405 has extremely strong surface activity and moisture replacement ability. When treating workpieces, it can quickly replace the water film on the metal surface, and re-establish a complete oil film on the surface to ensure that the coating is free of bubbles and voids, and truly "watertight".
Third, the measured data speak: a complete record of 150 hours of salt spray testing
In a third-party authoritative laboratory, Hank BS-405 electroplating anti-rust oil was subjected to a standard neutral salt spray test (ASTM B117). The test sample was galvanized steel sheet, and the pretreatment process was alkaline degreasing, pickling, electrogalvanizing, passivation (trivalent chromium passivation), then dipped in BS-405 anti-rust oil, drained and left at room temperature for 24 hours to completely cure the oil film.
The test results are as follows:
- 24 hours: no obvious change in the surface of the sample, good gloss, no white rust formation.
48 hours: The surface of the sample remains clean, with only a small amount of oil film yellowing and no corrosion spots.
72 hours: Very slight off-white marks begin to appear in the corners, but within the allowable range, no rust spots visible to the naked eye are formed.
96 hours: The sample surface remains intact, with a white rust area of less than 5%, well below the industry standard of 30% cutoff.
- 120 hours: The oil film remains intact, no red rust appears, and the coating does not bubble or fall off.
- 150 hours: A very small amount of speckled white rust appears on the edge of the sample, but it does not penetrate the coating, and the base metal does not undergo any rust. The final evaluation of the test is passed.
This not only proves that the BS-405 can meet the anti-rust requirements of demanding industries such as automotive parts, electronic components, and standard parts, but also means that after using the Hank BS-405, electroplated workpiece manufacturers can safely ship their products to all parts of the world, even in the high temperature and humidity environment of shipping containers, they can still maintain the perfect condition when they leave the warehouse.
IV. The seven core advantages of the Hank BS-405
1. Long anti-rust cycle: neutral salt spray for more than 150 hours, which is 2 to 3 times that of ordinary anti-rust oil, greatly prolonging the bare anti-rust period of the workpiece.
2. Specially designed for electroplating parts: suitable for galvanizing, nickel plating, chrome plating, tin plating, alloy plating and other types of electroplating surfaces, no damage to the passivation film, compatible with a variety of post-processing processes.
3. The film layer is thin and non-sticky: using a low viscosity formula, the thickness of the oil film is controlled at 1 to 3 microns, and the surface of the workpiece is not greasy or dripping. No additional cleaning is required during assembly, and it can be directly entered into the next process.
4. Excellent lubrication performance: The oil film has a slight lubricating effect, which can effectively reduce friction and reduce biting when assembling fasteners such as bolts and nuts.
5. Safe and environmentally friendly: does not contain harmful substances such as barium, chlorine, bromine, and heavy metals. It has passed the SGS environmental protection test and meets the requirements of RoHS and REACH regulations.
6. Easy to use: It can be dipped, brushed, sprayed, etc., and can be used at room temperature without heating, easy to operate, and energy saving.
7. Cost-effective: Although the price per liter is slightly higher than that of ordinary anti-rust oil, the comprehensive protection time is longer, the scrap rate is lower, and the overall cost decreases.
V. Applicable scenarios and typical application cases
Auto parts industry: Fasteners, brake discs, clutch pressure plates, shock absorber piston rods and other electroplated parts are treated with anti-rust treatment before assembly, which can not only pass the salt spray test specified by the customer, but also ensure that they will not rust within 2 years after assembly.
Standard parts and hardware industry: a large number of small parts such as screws, nuts, washers, spring gaskets, etc., are handled by a centrifugal oil immersion machine, resulting in high efficiency, uniform oil film, and significantly improved product quality.
Electronic and electrical industry: connectors, terminals, shields and other gold-plated, silver-plated parts, BS-405 will not affect the electrical conductivity, nor will it corrode plastic or rubber materials, making it a precision protection solution.
Outdoor equipment and agricultural machinery parts: metal parts used in high salt spray environments, such as guardrail fittings and agricultural machinery bolts, BS-405 can provide permeability and self-healing that traditional anti-rust wax cannot match. Even if there are minor scratches on the surface, the oil film can slowly level and cover the wound to prevent local rust from expanding.
After the introduction of Hank BS-405, a well-known automotive parts supplier increased the salt spray test time of its galvanized bolts from 96 hours to 150 hours, and the customer acceptance rate increased significantly. At the same time, the use of anti-rust packaging and desiccant was reduced, saving about 120,000 yuan per year.
VI. Use Suggestions and Precautions
In order to achieve the best salt spray effect for 150 hours, follow the following operating instructions:
1. The surface of the workpiece must be cleaned: After electroplating, it should be fully cleaned to remove residual acids, alkalis, salts, and other contaminants. It is best to passivate and dry thoroughly.
2. Control the thickness of the oil film: When dipping, the workpiece is soaked for at least 30 seconds, and it is slowly lifted to ensure that the oil film is uniform; if it needs to evaporate quickly, it can be used with a dryer or centrifuge to remove excess oil.
3. Keep the oil clean: Avoid mixing water and impurities during use, and cover the barrel when not in use for a long time to prevent volatilization and oxidation.
4. Safe storage: This product is an oily liquid and should be stored away from fire sources in a cool and ventilated place away from direct sunlight.
Conclusion
In the increasingly competitive manufacturing environment, every "small improvement" can become a "big advantage" in market competition. Hank BS-405 electroplating anti-rust oil, with 150 hours of hard core salt spray, provides a set of efficient anti-rust solutions for the electroplating industry. It is not only a simple protection of metals, but also a powerful tool to help enterprises reduce costs, improve quality and win word-of-mouth. If you are also worried about salt spray testing of electroplated workpieces, it is better to try Hank BS-405 and let "150 hours rust-free" become the quality label of your products.
