Protection Countermeasures to Screw Spikes and Achieving Results

From the above analysis, it can be known that electrochemical corrosion is the main cause of corrosion failure of railraod screw spikes. In order to protect the spikes and avoid or slow down corrosion during use, the following measures can be adopted.

(1) Selection of railroad screw spikes
When new railroad spikes are added to the threads and when the anchor is failed spikes, it is necessary to choose the spikes made of alloy materials or carbonitrided spikes, and the spikes with anti-corrosion sleeves are installed between the first threaded part and the second threaded part. It is also optional. Using anticorrosive spikes from the source is an effective way to prevent spikes from corroding.

(2) Selection of non-sulfur anchoring materials for anchoring
At present, sulfur anchoring agent is mainly used for the anchoring of railway screw spikes in China. Sulfur anchoring agent is convenient and quick in anchoring operation, but HS, S2, SO2 in sulfur anchoring agent will produce acidic electrolyte solution when combined with water, which will make the screw thread The road studs are severely corroded. In addition, sulphur must be boiled by fire during anchoring operations. Using fire to boil sulphur along the railway line will pollute the environment, waste wood, and destroy crops. Through comparison, Anyang Railway Equipment Co., Ltd choose a new water-soluble anchoring agent with hydraulic cementing material pure silicate 525 white cement as cementing material and emery as aggregate. A certain amount of rust inhibitor is added to it, and the ingredients are all environmentally friendly materials. When the non-sulfur anchoring agent is prepared after the anchor is changed on site, it is only necessary to mix the various materials and water in the formula evenly in proportion to use. While reaching the requirement of not less than 60KN, the anti-corrosion of threaded spikes is realized. purpose.

(3) Coated with long-lasting anti-corrosion grease
Railway Screw Spikes work in severe cold, high temperature, rain, wind and sand, and corrosive media containing O2, SO2, Cl2 and other corrosive media. They are also subject to axial vibration and radial torsion. Common anti-corrosion greases are far from meeting the needs of anti-corrosion. It is necessary to add solid fillers, antioxidants and metal deactivators, anti-corrosion and anti-rust agents, etc., in order to improve and enhance the anti-rust and anti-water performance of the anti-corrosion grease, and meet the different requirements of protection. At present, our section arranges to apply anti-corrosion oil to the main main line spikes once a year. Through comparison, Anyang Railway Equipment Co., ltd uses special anti-corrosion long-lasting grease for railway screw spikes, this grease can effectively protect the spikes. It has good water resistance, oxidation resistance, corrosion resistance, lubricity, adhesion, high and low temperature resistance, and is easy to paint, which delays the further development of corrosion, prolongs the service life of road studs, and reduces dimensional modification Anchor workload.

(4) Standardize the anchoring process
When using non-sulfur anchoring agent to anchor the spiral spike, it is necessary to use the anchor frame as required to ensure the accurate position of the spike. When anchoring, the spike holes should be cleaned up, and the solution should be filled at a time. It should not be too full but not too little. After anchoring, the round platform of the spiral spike should be 0~2mm higher than the sleeper supporting rail table (when using elastic clips fasteners) , The spike hole should be fully filled. After the anchoring solution is solidified, use a flat shovel to clean up the spilled anchoring agent, and trim the surface of the spike hole to avoid corrosion of the spike's round table due to unevenness and moisture retention.

Achieve results for Anti-corrosion on Screw Spikes
Anyang Railway Equipment Co., Ltd(AT). has adopted a set of effective countermeasures through analyzing the reasons for the corrosion of the screw spikes. In the daily maintenance process, it attaches great importance to the oiling progress and quality of the spikes, and the position of the anchored spikes. Carry out anti-corrosion coating treatment; for the failed screw spikes, nitriding treatment or alloy spiral road studs are preferred, and water-soluble non-sulfur anchoring agent is used for anchoring. Through long-term use and observation, the corrosion of spikes on the line has been effectively controlled, material investment has been saved, the service life of spikes has been effectively prolonged, the working pressure of anchor change has been slowed, and the stability of the track frame has been ensured. Improved driving safety and achieved good overall benefits.