39results about How to "Solve the corrosion resistance" patented technology

The invention discloses a corrosion resistant heavy rail steel with excellent strength-toughness, fatigue resistance and abrasive resistance, belonging to the technical field of heavy rail steel. A fundamental alloy system comprises the following alloy elements by weight percent: 0.55%-0.72% of C, 0.35%-1.1% of Si, 0.7%-1.40% of Mn, 0.2%-0.65% of Cr, 0.2%-0.65% of Cu and Fe as the balance; on thebasis of the above fundamental ingredients, one or more than one microalloy elements are simultaneously added, including: 0.01%-0.055% of Nb, 0.05%-0.10% of V, 0.001%-0.05% of Ti, 0.1%-0.3% of Ni and0.15%-0.3% of Mo. The heavy rail steel has the advantage that: mechanical properties of steel rail including strength, toughness, fatigue resistance, abrasive resistance, fracture toughness property and welding property are remarkably enhanced, so that superfine pearlite can be obtained without the need of adopting complex production technology such as rail end quenching. And simultaneously, the steel includes corrosive resistance so as to greatly enhance the service property and the service life of steel rail in corrosive environment.

The invention provides a magnesium alloy direct chemical plating NI-P-SiC plating solution formula and a plating process. The formula consists of chemical plating Ni-P plating solution and SiC dispersing solution, wherein the chemical plating Ni-P plating solution comprises 20-30g / l of nickel sulfate, 20-30g / l of sodium hypophosphite, 15-30g / l of complexing agent, 15-25g / l of sodium acefate, 10-20g / l of fluoride, 1-2mg / l of stablizer, appropriate amount of pH value modifier and the balance of water; the SiC dispersing solution is formed by stirring 10-80mg / l of surface active agent and 1-8g / lof micron SiC by magnetic force; and after pretreatment of the magnesium alloy, a Ni-P-SiC composite plating layer with thickness being 20-50Mum is obtained under the process conditions that the temperature is 80-90 DEG C, the pH value is 4.8-5.6, and the plating time is 60-120 minutes. In the invention, basic nickel carbonate is replaced by nickel sulfate which is introduced as main salt; and the micron SiC is added to conduct plating directly; on the base of keeping the excellent performance of magnesium alloy chemical plating Ni-P alloy, the rigidity and abrasive resistance of the magnesium alloy chemical plating layer are greatly improved; the problem of lower abrasive resistance of magnesium alloy nickel-plating layer is solved; and the preparation of the plating solution is convenient, the cost is low, the plating solution is stable and the deposition rate is quick.