Henkel can now offer a number of new generation solutions to metal pre-treatment processes. BONDERITE® M-NT thin film conversion coatings are designed to enhance multi-metal parts (steel, iron, aluminium, zinc) and overcome the issues associated with traditional phosphating, such as high energy costs, excessive sludge and scale generation, environmental and health and safety concerns. In contrast, BONDERITE® M-NT coatings, which are much thinner than traditional zinc or iron phosphates, offer a 10-30% process cost saving, while further advantages include the absence of phosphate or nickel salts, and no polymers in the conversion bath.
Henkel can provide products such as BONDERITE® M-NT 1200, BONDERITE® M-NT 20120, BONDERITE® M-NT 2011 and BONDERITE® M-NT 40042 to suit different pre-treatment processes requiring various numbers of steps.
To illustrate the potential benefits available, a traditional zinc phosphating process comprises seven steps: cleaning, rinse, conditioner/activator, phosphating at 55°C, rinse, post-rinse and DI (deionised water) rinse. Using BONDERITE® M-NT 1200, however, this can be reduced to just five steps*: cleaning, water rinse, DI rinse, BONDERITE® M-NT 1200 thin film conversion coating, and a final DI rinse (*note, this is dependent on a high level of cleaning; sometimes two cleaning stages will be required, meaning a minimum of six stages). In addition, conversion coating takes place at ambient temperature, so there is no need to use energy heating the bath.