Reasons and solutions for the failure of anti-rust oil in practical application!
December 31, 2021
Many customers choose expensive anti-rust oil, but rust will still occur. Here we should pay attention to the following correct use methods, especially the surface pretreatment of the workpiece as much as possible:
1. Surface derusting: manual derusting is easy to be incomplete, so it is necessary to cooperate with chemical derusting 2. Surface cleaning: After using solvents, alkaline cleaning fluids, and acidic cleaning, it must be neutralized with aqueous cleaning fluids and alkaline cleaning agents. At the same time, there should be no white spots left after cleaning 3. Surface drying: replacement dehydration, drying, wiping and draining. 4. For precision parts, especially engine gearboxes, in order to ensure cleanliness, there should be no white spots remaining. 5. The anti-rust oil should be filtered regularly, and the filter bag should be cleaned and replaced to reduce contamination by impurities and maintain the cleanliness of the anti-rust oil 6. Regular drainage (cleaning agent, anti-rust agent, cutting fluid) to avoid emulsification of anti-rust oil.
Method of applying anti-rust oil Soaking method: Large quantities of small and medium metal products and parts can be soaked by hand, or settled by semi-automatic cylinder. Brushing method: Manually brushing with oil, generally used for local rust prevention. Spraying method: use a through-type oiling machine to spray anti-rust oil, or manual spraying. Atomization method: In recent years, because customers want less oil to prevent rust, atomization oiling machines have become more and more widely used. What are the reasons for the failure of anti-rust oils in practical applications? case analysis • After the workpiece is cleaned incompletely, • Especially cast iron parts have been exposed to corrosive media such as human sweat before oiling. • The nozzle of the oil spreader is clogged, causing partial paint leakage. • Drying is not complete, or the temperature is insufficient, but the surface is dry • Manual oil brushing is uneven, causing accumulation • The quality of packaging materials is not good or the packaging technology is substandard, resulting in poor sealing performance or failure to achieve the purpose of sealing and sealing. • Washing with kerosene or diesel oil. Dirty substances are mixed with rust preventive oil, causing rust preventive oil pollution • Long storage period, anti-rust oil reacts with packaging film • Overlapping workpieces, local oil spots are corroded • Soaking or spraying time is too short, resulting in insufficient film formation time.
Case study 1: Dehydration or drying treatment is not thorough before applying anti-rust oil • Unit: One month after a certain gearbox differential is oiled, rust occurs • Actual anti-rust process – Rinse with water-based cleaning agent. – Dry (80-90℃) for 2 minutes. – After cooling, immerse in anti-rust oil for about 1 minute. – After manual drying, use anti-rust bags to pack. • Analysis of the causes of corrosion – The exhaust pipe is made of cast iron, which has more casting surfaces and is easy to retain liquid. – There is an inner cavity, residual moisture, -Back wall parts, insufficient drying temperature – The remaining liquid causes emulsification and affects the anti-rust effect of the immersed anti-rust oil. – The current used sealing anti-rust oil for cast iron material requires extremely strong adsorption and film-forming type. • Suggest anti-rust process – It is recommended to strengthen the manual purge of the inner cavity of the exhaust pipe -Increase the drying temperature to 120 degrees – Cooling to room temperature, – Use RK301 dehydration anti-rust oil to dehydrate for 2 minutes and drain regularly. – Sealing and anti-rust
