The corrosion behaviour of manganese phosphate coatings applied to AISI 4140 steel subjected to different heat treatments

The effects of niobium and nickel on the corrosion resistance of the zinc phosphate layers

“…There are many types of phosphating baths such as, zinc based [1,[17][18][19][20], manganese based [4,[21][22][23], tricationic [24], organic phosphate [6,25,26] or even a combination of them. The type of coating used depends on the phosphated material application.…”

Efeitos da variação da concentração de solução polimérica aquosa a base de PVP na têmpera de aço AISI 4140

“…Comparativamente, os estudos de Totic, Y. [12], demonstraram que esse mesmo aço quando temperado em água e em óleo desenvolveu valores próximos a 760 HV para a água e 590 HV para o óleo, ambos medidos na sua superfície da peça [12]. Outros experimentos, evidenciaram que o material quando submetido à têmpera em água apresentou 60 HRC em sua superfície e 55 HRC ao ser resfriado em óleo, valores referentes, respectivamente, a 700 e 595 HV [13,14,15].…”

Characterisation of phosphate coatings obtained using nitric acid free phosphate solution on three steel substrates: An option to simulate TMT rebars surfaces

“…Depending on different specific properties (corrosion resistance, paint adhesion, coefficient of friction) requirement on different metals (steel, cast iron, Mg alloys and Al alloys) surfaces, phosphate treatment has significant role [11,14,[16][17][18][19][20][21]. The manganese phosphate coating obtained on AISI 4140 steel substrate after various heat treatments yield an important improvement in the corrosion resistance of the coatings [22]. Zinc phosphate has better insulating ability than manganese phosphate [23] and therefore expecting for better protection capability.…”