The corrosion resistance of automobile shock absorber is one of the main factors affecting the quality and life of automobile shock absorber. The separation and release of the process parameters of connecting rod electroplating determines the quality and common corrosion resistance of the chrome plating layer. The corresponding relationship between the current density of the automobile shock absorber connecting rod and the structure of the inscription layer is found out. The salt spray test of the connecting rod with different surface quality is compared with that of Nengming: The superfine surface machining of the connecting rod of the automobile grabber by plating can obviously improve the corrosion resistance of the connecting rod. The research results provide an effective way to optimize the electroplating production process of enterprises and improve the manufacturing level of automobile shock absorber.
1, don't
The automobile shock absorber connecting rod is the heart part of its suspension system. If the corrosion-resistant side energy is not enough, the early failure of the connecting rod will result in oil leakage. The damage of automobile shock absorber caused by corrosion of the connecting rod has a higher proportion. Therefore, it is very important to improve the corrosion resistance of the shock absorber connecting rod.
2. Connecting rod processing technology
The connecting rod is made of No. 35 steel. The processing technology is as follows:
Cold drawing forming → turning → continuous medium frequency induction quenching → pre-grinding → pre-grinding outer circle → pre-grinding outer circle → superfinishing → Electroplating → Dehydrogenation tempering → superfinishing grinding.
3. Analysis of test results
The salt spray test standard is GB6458-86 Neutral Salt Spray Test for Metal Overburden (NSS). The salt spray test equipment is Heraeus Germany HSK-1000 salt spray test riding box with power of 2.8KW.
3.1 Salt spray resistance test
3, 2 current density and the relationship between the absorption of atmosphere
3.3 Influence of superfinishing on chrome plating of connecting rod
4, the conclusion
(1) when the flow density is larger, the atmosphere brittle tendency is larger, corrosion resistance is also poor. Through salt spray test and tissue analysis, it can be known that the optimal current current density of the automobile shock absorber connecting rod is 58A/ DRn2 under the condition of current first production.
(2) Under the same electroplating process conditions, the superfinishing automobile connecting rod before electroplating has reduced ammonia absorption and obtained evenly distributed and fine microcracks, reduced hydrogen overpotential, and significantly improved the corrosion resistance of the electroplating layer, which has a high practical value for improving the electroplating process of the connecting rod of the vapor dielectric shock absorber.