．Chromium plated cylinder

● Microscopic metallurgic structure
of chromium coating

　The cylinder produced by us is a hard chromium plating. The chromium layer provides features, such as hardness, durability, corrosion resistance, low friction factor, and so on. It is a very normal surface treatment in the industry. For the chromium plating of cylinder, we have developed several basic specifications for chromium plating layer of cylinder:

  • ■　Most design data of the hardness for chromium plating
    　　layer on cylinder specify >HV800. Our specifications
    　　specify HV850~950. In addition to the compliance to
    　　general requirements, we also consider the abrasion
    　　conditions of related abrasive objects.

    ■　To cooperate the proceeding grinding or boring processes,
    　　the chromium plating of cylinder make the relative thickness
    　　of chromium plating layer more than 0.07 mm. The inner
    　　stress should be minimized to eliminate the crack due to
    　　high inner stress.

    ■　A certain porous condition satisfies the oil condition required
    　　by lubrication for reciprocal movement.